<PAGE>   1

                                                                   EXHIBIT 10.03

                      AMENDMENT TO ASSET PURCHASE AGREEMENT

         THIS AMENDMENT TO ASSET PURCHASE AGREEMENT ("Amendment") is made and
entered into as of the 30th day of January, 2001, by and among HIGH SPEED NET
SOLUTIONS, INC., a Florida corporation ("HSNS"), SUMMUS, LTD., a Delaware
corporation ("Summus"), and BJORN JAWERTH, a shareholder of Summus ("Jawerth").

                                   WITNESSETH:

         WHEREAS, the parties entered into an Asset Purchase Agreement dated as
of October 30, 2000 ("Agreement"), pursuant to which HSNS would acquire all of
the assets of Summus;

         WHEREAS, some of the conditions to closing set forth in the Agreement
have not been satisfied;

         WHEREAS, with certain modifications to the transaction contemplated by
the Agreement, as set forth herein, the parties still desire to combine the
businesses of Summus and HSNS by having HSNS acquire all of the assets of Summus
on the terms and conditions set forth in the Agreement, as modified and
amendment by this Amendment.

         NOW, THEREFORE, for and in consideration of the premises, and the
mutual covenant and agreements contained herein, and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties hereto agree as follows:

         1.       AMENDMENTS TO AGREEMENT. The following Paragraphs or
provisions of the Agreement are hereby modified or amended as indicated:

                  1.1:     Delete "but excluding the Excluded Assets described
                           below".

                  1.1(M):  Delete "("Common Stock")".


<PAGE>   2

             2.1:          Is revised to read as follows:

                           PURCHASE PRICE. In consideration of the sale,
                  assignment, transfer and conveyance of the Acquired Assets,
                  and in reliance upon the covenants, representations and
                  warranties made herein by Summus and the Stockholders, HSNS
                  shall:

                           (A)      Issue and deliver a total of 20,012,552
                  shares of Common Stock and 4,000 shares of Convertible
                  Preferred Stock, plus adjustment for options exercised prior
                  to Closing at the conversion ratio set forth in PARAGRAPH 4.8,
                  to Summus pursuant to PARAGRAPH 3.2 below;

                           (B)      Issue and deliver 2,000 shares of
                  Convertible Preferred Stock to the Escrow Agent (as defined in
                  the Escrow Agreement referred to below) to be held and
                  distributed by the Escrow Agent pursuant to the terms of this
                  Agreement and the Escrow Agreement attached to this Agreement
                  as EXHIBIT D to be executed and delivered by the parties
                  pursuant to PARAGRAPH 3.2 below as security for obligations of
                  Summus and the Stockholders under this Agreement (the "ESCROW
                  AGREEMENT").

                                    (I)      The shares of Convertible Preferred
                  Stock issued pursuant to this Clause 2.1(b) (the "ESCROWED
                  SHARES") shall be issued in the name of the Escrow Agent, as
                  escrow agent under the Escrow Agreement. The Escrowed Shares
                  shall be held for twelve (12) months from the Closing Date.

                                    (II)     The parties hereby appoint BB&T,
                  effective as of the Closing Date, to serve as the Escrow Agent
                  for purposes of administering the escrow arrangements
                  contemplated by the Escrow Agreement (such representative, or
                  any successor representative appointed under the Escrow
                  Agreement, the "ESCROW AGENT").


                                        2
<PAGE>   3

                           (C)      Issue and deliver warrants to purchase a
                  total of 500 shares of the Convertible Preferred Stock,
                  exercisable on an "as converted" basis at the closing market
                  price on the Closing Date (the "WARRANT EXERCISE PRICE") for a
                  period of five (5) years from the date of this Agreement (the
                  "WARRANT EXERCISE PERIOD") (the "WARRANTS"). (It is
                  anticipated that Summus' plan of liquidation will provide for
                  distribution of the Warrants on a pro-rata basis to Summus
                  shareholders other than HSNS and Bjorn Jawerth and HSNS and
                  Bjorn Jawerth waive their rights to participate in
                  distribution of the Warrants).

                           (D)      Assume the Assumed Liabilities as defined in
                  PARAGRAPH 2.2 below.

                  The shares of Common Stock and Convertible Preferred Stock
                  referred to in the foregoing clauses (a) and (b) are
                  collectively referred to as the "STOCK PURCHASE PRICE," and
                  together with the items referred to in the foregoing clauses
                  (c) and (d), the "PURCHASE PRICE."

         3.2(A):           Insert ", Convertible Preferred Stock" after "Common
                           Stock".

         3.2(A)(VI)(A):    Insert "and Convertible Preferred Stock" after
                           "Common Stock".

         3.2(A)(VI)(B):    Substitute "Convertible Preferred Stock for "Common
                           Stock".

         3.2(A)(VII):      Substitute "Convertible Preferred Stock" for "Common
                           Stock".

         3.2(A)(XII):      ARTICLES OF AMENDMENT. Certified Articles of
                           Amendment authorizing 6,500 shares of Convertible
                           Preferred Stock.


                                       3
<PAGE>   4

         3.2(B)(I):        Delete "; and (iv) that the shares representing the
                           Stock Purchase Price have been acquired for
                           investment and not with a view to resale, except as
                           provided in Paragraphs 9.12 and 9.13 below".

         4.5(A):           Substitute "Purchase Price" for "Common Stock".

         4.8:              Substitute "21.9733" for "18.5629".

         4.10:             Is revised to read as follows:

                           BOARD OF DIRECTORS AND SENIOR MANAGEMENT.

                           (A)      Prior to the Closing, HSNS and Summus agree
                  that each party shall maintain its own Board of Directors
                  having a majority of members who are not "INSIDERS." Until the
                  Closing, a Special Committee of the Summus Board of Directors
                  will set guidelines for Summus' expenditures and must approve
                  any proposed deviation from these guidelines before any such
                  expenditure are made. Immediately following the Closing, the
                  size of the HSNS Board shall be increased to ten, with eight
                  directors initially - four from HSNS (Herman Rush, Richard
                  Seifert, Cristine Wittress, and Andrew Fox), and four from
                  Summus (Bjorn Jawerth, Kenneth Marks, Stuart Diamond, and
                  Chris Gaertner. The four board members from HSNS will search
                  for and select an additional director; when that selection has
                  occurred, the selected director and Wendi Tush will be elected
                  by the Board as the ninth and tenth board members. Until those
                  final board members are elected, Wendi Tush will be entitled
                  to attend and speak at board meetings as an observer.


                                       4
<PAGE>   5

                  Effective at Closing, Stuart Diamond will serve as Chairman of
                  the Board and Rick Seifert as Vice-Chairman. Upon hiring a new
                  CEO, Bjorn Jawerth shall become Chairman of the Board, unless
                  he declines. All directors must stand for re-election after
                  one year at the annual shareholder meeting as per HSNS'
                  by-laws.

                           (B)      Effective at Closing, the senior management
                  team will consist of: Bjorn Jawerth, co-Chief Executive
                  Officer and Chief Scientist; Rick Seifert, co-Chief Executive
                  Officer; Gary Ban, Chief Operating Officer; Rob Lowrey, Chief
                  Financial Officer; Andy Fox, President. A search for a new CEO
                  will begin immediately, conducted by a special committee
                  consisting of outside directors. The decision to hire a new
                  CEO shall require the affirmative vote of 2/3 of the
                  directors. Personnel reduction will be determined by the
                  senior management team, except the Board shall make such
                  determination if the senior management team is deadlocked.

                           (C)      Approval of any merger or acquisition of or
                  by HSNS shall require the affirmative vote of 2/3 of the
                  directors and, if necessary, the directors shall amend the
                  by-laws, or propose a by-law amendment for shareholder
                  approval, to so provide.

         4.11(B):          Insert before the period at the end of the Section,
                           ", in which case, holders of shares issued as Stock
                           Purchase Price, and their successors and assigns,
                           shall have resale registration rights as provided in
                           Paragraph 4.15(a)".


                                       5
<PAGE>   6

         4.12:             Insert before the period at the end of the Section,
                           "or pursuant to the provisions of Paragraph 4.16".

         4.14(B):          In the first sentence, substitute "until the earlier
                           of (i) the Closing Date or (ii) March 31, 2001" for
                           "until the earlier of (i) the Closing Date or (ii)
                           three months after the date of this Agreement."

         4.14(F):          Change "within sixty (60) days of the date of this
                           Agreement," to "by March 31, 2001,".

         4.15:             Change caption to "Registration Rights"

                           Redesignate subsections (a), (b) and (c) as (b), (c)
                           and (d) and add subsection (a) as follows:

                                    "(A) DEMAND REGISTRATION. If a North
                           Carolina Permit is not obtained as described above,
                           and the Stock Purchase Price is provided by private
                           placement of Common Stock and/or Convertible
                           Preferred Stock, then, at any time prior to the
                           effectiveness of HSNS' Form S-1 Registration
                           Statement (SEC File No. 333-41730) (the "S-1
                           Registration Statement") upon written notice to HSNS
                           from the holders of at least 50% of the shares issued
                           as Stock Purchase Price, on an as-converted basis,
                           HSNS shall (1) give prompt written notice to all
                           other holders of shares issued as Stock Purchase
                           Price, (2) amend the S-1 Registration Statement to
                           include for resale any such shares of Common Stock as
                           may be requested by the holders of such shares in
                           writing within 10 business days after receipt of such


                                       6
<PAGE>   7

                           notice from HSNS (the "Demand Shares") and (3) use
                           its best efforts to have the S-1 Registration
                           Statement declared effective by the SEC as promptly
                           as practicable after the filing of such amendment;
                           provided, however, that HSNS shall not be required to
                           attempt to register shares of Common Stock that
                           cannot be issued under the charter documents of HSNS.
                           To the extent that any Demand Shares are included
                           therein, until all of such Demand Shares have been
                           distributed, HSNS shall keep the S-1 Registration
                           Statement effective or, in the alternative, can
                           terminate the S-1 provided such Demand Shares are
                           covered by an S-3 registration or other form of
                           registration. In addition, for as long as the S-1
                           Registration Statement remains effective, HSNS shall
                           file such prospectus supplements as necessary to
                           permit public sales of Demand Shares by transferees
                           of the holders of Demand Shares listed in the S-1
                           Registration Statement, to the extent that such
                           transferees received such shares in a private
                           transaction. HSNS shall pay all expenses relating to
                           the registration under this subsection other than
                           underwriting discounts, selling commissions, fees and
                           expenses of counsel." In new subsection (B) (COMPANY
                           REGISTRATION), add the following after the last
                           sentence of that subsection: "The rights in this
                           subsection 4.15(b) are in addition to the rights
                           granted above in subsection 4.15(a) and in no way
                           limit Summus' or Summus shareholders' ability to
                           include shares in the S-1 Registration Statement."


                                       7
<PAGE>   8

                           In new subsection (C) (UNDERWRITING), substitute for
                           "part (a)(i) above" in the third line, "part (b)(i)
                           above", and substitute for "Section 2.3(b)" in the
                           last sentence of the second paragraph "subsection
                           4.15(c)".

                           Insert after "Common Stock", wherever it appears,
                           "including common stock issued upon conversion of
                           Convertible Preferred Stock";

                           Substitute for "Stockholder" and "Stockholders",
                           "Summus shareholder" and "Summus shareholders",
                           respectively.

         4.16:             The first sentence is revised to read: "Summus and
                           each Stockholder agree that, except for those shares
                           referred to in Paragraphs 9.12 and 9.13, none of the
                           shares of Common Stock or Convertible Preferred Stock
                           included in the Share Purchase Price may be sold in
                           public market transactions during the twelve (12)
                           months following the Closing, provided that one and
                           one-half percent (1.5%) of the shares held by Summus
                           and each Summus shareholder and included in the Stock
                           Purchase Price (including shares of Common Stock
                           issued upon conversion of shares of Convertible
                           Preferred Stock) may be sold or otherwise disposed of
                           in each of the third through twelfth months following
                           Closing. Summus agrees that it shall require a
                           similar agreement from any Summus stockholder who
                           receives a distribution of shares of Common Stock or
                           Convertible Preferred Stock included in the Share
                           Purchase Price, prior to receiving such
                           distribution."


                                       8
<PAGE>   9

         4.17:             DELETED

         4.19:             Substitute "3,669,539" for "3,111,293".

         6.4:              Is revised to read as follows:

                                    6.4      AUTHORIZATION OF COMMON STOCK AND
                           CONVERTIBLE PREFERRED STOCK. The shares of Common
                           Stock and Convertible Preferred Stock to be issued at
                           Closing pursuant to this Agreement will be duly
                           authorized and reserved for issuance at or before the
                           Closing and upon issuance pursuant to the terms of
                           this Agreement will be (a) validly issued, fully paid
                           and nonassessable; (b) free of any preemptive rights
                           or rights of first refusal, with the exception of
                           encumbrances contemplated by the Escrow Agreement and
                           the Voting Trust Agreement, the form of which are
                           attached hereto, and securities law restrictions,
                           free of any Liens or encumbrances. Summus and each
                           Stockholder acknowledge that the charter documents of
                           HSNS do not authorize a sufficient number of shares
                           of Common Stock to allow the conversion of shares of
                           Convertible Preferred Stock, the exercise of the
                           Warrants, and the exercise of all outstanding options
                           and all options to be granted as reflected in this
                           Agreement, as amended. Promptly after the later of
                           (i) Closing, or (ii) HSNS shares becoming quoted and
                           trading on the OTC Bulletin Board following
                           effectiveness of the HSNS S-1 Registration Statement,
                           but in any event, HSNS shall file proxy materials
                           with the SEC not later than July 31, 2001, HSNS shall


                                       9
<PAGE>   10

                           use its best efforts to cause its charter documents
                           to be amended to increase the number of authorized
                           shares of its common stock to an amount sufficient
                           for the transactions contemplated by this Agreement,
                           as amended, including the conversion of shares of
                           Convertible Preferred Stock, the exercise of the
                           Warrants, and the exercise of all outstanding options
                           and all options to be granted as reflected in this
                           Agreement, as amended, and at the effective time of
                           such amendment, HSNS shall reserve the requisite
                           number of shares of common stock for issuance.

         6.7:              Insert in the second line after "per share",
                           "("Common Stock")". In the second sentence,
                           substitute "and 2,000 shares of HSNS preferred stock
                           were outstanding." for "and no shares of HSNS
                           preferred stock were outstanding."

         7.1(B):           Insert after "Escrowed Shares" in the 13th line and
                           the 18th line, "(on an "as converted" basis)".

         8.11:             Insert in the second line after "Agreement," "as
                           modified and amended by the Amendment,".

         8.12:             Is revised to read as follows:

                           "The charter documents of HSNS have been amended, if
                           necessary, to designate a class (and sufficient
                           number of authorized shares) of convertible preferred
                           stock which will have equivalent rights as Common
                           Stock with regard to voting,


                                       10
<PAGE>   11

                           dividends and liquidation (on an "as converted"
                           basis) and shall be convertible into 1,000 shares of
                           Common Stock for each share of convertible preferred
                           stock ("Convertible Preferred Stock"). The
                           preferences, limitations, and relative rights of the
                           Convertible Preferred Stock are attached as Exhibit
                           L."

         8.13:             2000 PERFORMANCE BONUS. HSNS shall reserve 1,700,000
                           shares of Common Stock for calendar year 2000
                           performance bonuses for HSNS and Summus employees and
                           shall grant options to employees entitled to such
                           performance bonuses.

         9.10:             Insert after "Agreement," in the second line "as
                           modified and amended by the Amendment".

         9.12:             Is revised to read as follows:

                                    SALE OF BJORN JAWERTH'S HSNS COMMON STOCK.
                           HSNS shall use reasonable commercial efforts to
                           assist Bjorn Jawerth in the private sale of up to
                           $2,500,000 worth of his shares of Common Stock at a
                           per share price not less than $1.50.

         9:13:             Is revised to read as follows:

                                    SALE OF KERSTIN JAWERTH'S HSNS COMMON STOCK.
                           HSNS shall use reasonable commercial efforts to
                           assist Kerstin Jawerth in the private sale of up to
                           $1,000,000 worth of her shares of Common Stock at a
                           per share price not less than $1.50.


                                       11
<PAGE>   12

         9.14:             DELETED

         9.15:             Is revised to read as follows:

                           "The charter documents of HSNS have been amended, if
                           necessary, to designate a class (and sufficient
                           number of authorized shares) of convertible preferred
                           stock which will have equivalent rights as Common
                           Stock with regard to voting, dividends and
                           liquidation (on an "as converted" basis) and shall be
                           convertible into 1,000 shares of Common Stock for
                           each share of convertible preferred stock
                           ("Convertible Preferred Stock"). The preferences,
                           limitations, and relative rights of the Convertible
                           Preferred Stock are attached as Exhibit L."

         9.16              2000 PERFORMANCE BONUS. HSNS shall reserve 1,700,000
                           shares of Common Stock for calendar year 2000
                           performance bonuses for HSNS employees, including
                           those acquired from Summus as well as existing HSNS
                           employees and other new employees, and shall grant
                           options to employees entitled to such performance
                           bonuses.

         10.11(B):         Is revised to read as follows:

                           "either party may terminate the Agreement, as
                           amended, if the Closing does not occur within sixty
                           (60) days of the date of the Amendment."


                                       12
<PAGE>   13

         11.1:             Is amended by modifying or adding the following
                           definitions:

                           "COMMON STOCK" shall have the meaning set forth in
                           Paragraph 6.7.

                           "CONVERTIBLE PREFERRED STOCK" shall have the meaning
                           set forth in Paragraph 8.12.

                           "SUMMUS SHAREHOLDER" and "SUMMUS SHAREHOLDERS" shall
                           mean any one or more (including all) shareholders of
                           Summus as of the Closing Date.

         2.       FAIRNESS HEARING. It having been determined that a new
fairness hearing is required, the parties shall again comply with the provision
of Paragraphs 4.11, 5.28 and 6.10 of the Agreement with regard thereto.

         3.       REVISED EXHIBITS AND SCHEDULES. The Exhibits and Schedules
referenced below, copies of which are attached, are hereby substituted for, and
replace, the corresponding Exhibit or Schedule attached to the Agreement:

                           Exhibit B-1:      Executive Employment Agreement
                                             (Bjorn Jawerth)

                           Schedule 2.2(a):  Specified Assumed Liabilities

                           Schedule 4.7      List of Current Summus Employees

                           [LIST OTHERS]

         4.       NO OTHER MODIFICATIONS. Except as expressly set forth herein,
there are no other modifications or amendments to the Agreement, which remains
in full force and effect, as modified and amended by this Amendment.


                                       13
<PAGE>   14

         5.       GOVERNING LAW. The validity and effect of this Amendment shall
be governed by and construed and enforced in accordance with the Laws of the
State of North Carolina, without regard to its conflict of laws rules.

         IN WITNESS WHEREOF, the parties have executed or caused this Amendment
to be executed by their duly authorized agents as of the day and year first
above written.

HIGH SPEED NET SOLUTIONS, INC.             SUMMUS, LTD.


By: /s/ Andrew Fox                         By: /s/ Bjorn Jawerth
    ------------------------------             --------------------------------
    Andrew Fox, President                      Bjorn Jawerth, President

                                               STOCKHOLDER


                                               /s/ Bjorn Jawerth
                                               ---------------------------------
                                               Bjorn Jawerth


                                       14