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                                                                    EXHIBIT 4.08

                            CERTIFICATE OF AMENDMENT

                                       OF

                      RESTATED CERTIFICATE OF INCORPORATION

                                       OF

                                HNC SOFTWARE INC.

        HNC Software Inc., a Delaware corporation (the "CORPORATION"), does
hereby certify that the following amendment to the Corporation's Restated
Certificate of Incorporation has been duly adopted in accordance with the
provisions of Section 242 of the Delaware General Corporation Law, with the
approval of such amendment by the corporation's stockholders.

        The first sentence of Article IV of the Restated Certificate of
Incorporation, relating to the Corporation's authorized shares of stock, is
amended to read in its entirety as follows:

                        The total number of shares of all classes of stock which
                the corporation has authority to issue is One Hundred
                Twenty-Four Million (124,000,000) shares, consisting of two
                classes: One Hundred Twenty Million (120,000,000) shares of
                Common Stock, $0.001 par value per share, and Four Million
                (4,000,000) shares of Preferred Stock, $0.001 par value per
                share.

        IN WITNESS WHEREOF, the Corporation has caused this Certificate of
Amendment to be signed by its duly authorized officer this 5th day of June,
2000.

                                          HNC SOFTWARE INC.

                                          By:  /s/ Kenneth J. Saunders
                                               ---------------------------------
                                               Kenneth J. Saunders, Secretary

                                       43<PAGE>

                                                                   EXHIBIT 10.20

June 25, 2000

Mr. Matt Desch
Victoria Glade
Coronation Road
South Ascot
Berkshire, SL59LQ
UK

Dear Matt,

On behalf of the Board of Directors I am pleased to offer you the position of
Chairman of the Board of Airspan Networks, Inc.  The effective start date would
be July 1, 2000.

Compensation and expense coverage for this position would be as follows:

 .  Base salary of $275,000 per year

 .  Annual bonus plan developed each year under your and Eric Stonestrom's
   recommendation and implemented by the Board; annual bonuses will be targeted
   at 60% of base salary and capped at 100% of base salary

 .  Options to purchase up to 600,000 shares of common stock on a post split
   basis, (1,800,000 pre-split) at the IPO filing price, currently estimated at
   $10.00 per share. This represents approximately 1.5% of the Company on a post
   IPO basis. Options will vest monthly over two years beginning at start date.

 .  Airspan will pay directly to vendors on your behalf the cost of normal and
   reasonable UK living expenses, in accordance with Company policy, up to
   10,000 pounds sterling per month through June 2001.

 .  The Company will cover the reasonable cost of relocation to the U.S.

 .  The Company will cover the reasonable cost of providing you an office in
   Dallas, Texas upon relocation. (Sevin Rosen and Interwest have assured me
   that you are more than welcome at their offices on the 16th floor of the
   Galleria)
<PAGE>

 .  The Company will provide an office for you at the new corporate headquarters
   in Ft. Lauderdale, Florida.

Health and medical benefits will be provided consistent with those provided by
the Company to other executives.

In the unlikely event that your employment terminates involuntarily in the first
year, you will receive six months of your base salary as severance and will
automatically vest 150,000 shares on a post split basis. Beyond the first year,
a six-month severance payment of base salary will apply, but there will be no
acceleration of vesting beyond what has been earned.

In the event that a change of control occurs prior to your complete vesting,
your vesting schedule will be accelerated by the lesser of one year (300,000
shares post split) or the amount of your remaining unvested options.

Matt, there is great confidence that your leadership capabilities will greatly
contribute to the Company's international success as a world class
telecommunications firm.  I personally look forward to working with you, as does
Eric Stonestrom and the entire Board.

Sincerely,

/s/ Tom Huseby

Tom Huseby

Accepted:

Matthew J. Desch        June 27, 2000
----------------        -------------
Matt Desch              Date<PAGE>

                                                                   EXHIBIT 10.17
                                                                   -------------

                      CENTURY BUSINESS CREDIT CORPORATION
                             119 West 40th Street
                         New York, New York 10018-2566

                                                                  March 30, 2000

Tommy Hilfiger U.S.A., Inc.
25 West 39/th/ Street
New York, New York 10018

Ladies and Gentlemen:

     Reference is made to the Factoring Agreement between us dated as of April
1, 1998 (as amended, modified, restated and/or supplemented from time to time,
the "Agreement"). Any capitalized term used herein which is not otherwise
defined shall have the meaning given to such term in the Agreement. The parties
hereby agree that the Agreement is amended as follows:

     1.   Paragraph 6 is hereby amended in its entirety to provide as follows:

               "6.  Collections of our Receivables, less any sums remitted or
          otherwise paid to us or for our account, or debited to our account
          hereunder, shall be payable by you to us on the third business day
          following the date such collections are credited to us. However, if
          any Receivable as to which you have approved the credit standing of
          the customer shall not be paid by reason of the customer's bankruptcy
          or insolvency or within 120 days of maturity, you will pay us the
          purchase price thereof on the earlier of (a) the first Tuesday of the
          month following such customer's bankruptcy or insolvency, or (b) the
          first Tuesday following the Receivable becoming 120 days past due
          without dispute. Upon such payment to or for us, our assignment of the
          Receivable shall be effective to transfer title to such Receivable to
          you. The purchase price of Receivables sold and assigned to you each
          month shall be the net amount thereof, as herein defined, less the
          amount of your commission on the purchase of such Receivables as
          provided in paragraph 7 hereof. As used herein, the term "net amount"
          of Receivables shall mean the gross amount of Receivables, less
          returns, allowances and discounts to customers upon shortest or
          longest selling terms, as you may elect. To the extent a customer does
          not take advantage of an early payment discount made available to it
          and as a result thereof, you receive amounts in excess of the net
          amount of such Receivable, you will remit such amount to us."

     2.   Paragraph 7 is hereby amended in its entirety to provide as follows:

               "7.  For your services hereunder with respect to our sales, you
          shall receive a commission, which shall be chargeable to our account
          with you on the last day of each month, equal to the product of (a)
          the net face amount of each credit approved Receivable less selling
          discounts and (b) the commission rate set forth below opposite the
          applicable period in which such sale is made:
<PAGE>

               Period                             Commission Rate
               ------                             ---------------

               April 1, 1998 through              .3175%
               March 31, 1999

               April 1, 1999 through              .30000%
               March 31, 2000

               April 1, 2000 and thereafter       .1500%"

     3.   The first sentence of paragraph 13 is hereby amended in its entirety
as follows:

               "13.  The term of this Agreement began as of January 2, 1990 and
          shall continue until March 31, 2001."

     Except as specifically provided herein, the Agreement and all other
documents, instruments and agreements executed and/or delivered in connection
therewith as amended, modified, restated or supplemented, shall remain in full
force and effect, and are hereby ratified and confirmed. The execution, delivery
and effectiveness of this letter agreement shall not operate as a waiver of any
right, power or remedy of the undersigned, nor constitute a waiver of any
provision of the Agreement or any other documents, instruments or agreements
executed and/or delivered under or in connection therewith as amended, modified,
restated or supplemented.

     This letter agreement shall be governed by and construed in accordance with
the laws of the State of New York (without giving effect to the conflicts of law
provisions thereof).

     This letter agreement may be executed in one or more counterparts each of
which taken together shall constitute one and the same letter agreement.  Any
signature delivered by a party via facsimile shall be deemed to be an original
signature hereto.

     This letter agreement will only become effective upon execution of this
letter agreement by you.

                                   Very truly yours,

                                   CENTURY BUSINESS CREDIT CORPORATION

                                   By: /s/ Thomas V. Pizzo
                                      --------------------
                                      Name: Thomas V. Pizzo
                                      Title: President
Consented and Agreed to:

TOMMY HILFIGER U.S.A., INC.

By: /s/ Joel H. Newman
   --------------------
   Name: Joel H. Newman
   Title: President - Finance and Administration

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