SEC Filing Document

Company: Berto Acquisition Corp. II
Ticker: GUAC
CIK: 2081515
Filing Type: S-1MEF
Document Type: EX-5.1
Date Filed: 2026-05-15
Accession Number: 0001829126-26-005263
Exchange: 
SIC Code: 6770
SIC Description: Blank Checks
URL: https://www.sec.gov/Archives/edgar/data/2081515/000182912626005263/bertoacquisition2_ex5-1.htm

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the Company in accordance with their terms, subject to (i) applicable bankruptcy, insolvency, receivership, conservatorship, liquidation, reorganization, moratorium, fraudulent transfer and other laws affecting the enforcement of creditors’ rights generally, and (ii) the application of general principles of equity (whether applied by a court of law in equity or at law). The opinions expressed above are limited to questions arising under the law of the State of New York. We do not express any opinion as to the laws of any other jurisdiction. This opinion letter is for your benefit in connection with the Registration Statement and may be relied upon by you and by persons entitled to rely upon it pursuant to the applicable provisions of the Securities Act. This opinion letter is provided solely in connection with the distribution of the Units pursuant to the Registration Statement and is not to be relied upon for any other purpose.

The opinions expressed above are as of the date hereof only, and we express no opinion as to, and assume no responsibility for, the effect of any fact or circumstance occurring, or of which we learn, subsequent to the date of this opinion letter, including, without limitation, legislative and other changes in the law or changes in circumstances affecting any party. We assume no responsibility to update this opinion letter for, or to advise you of, any such facts or circumstances of which we become aware, regardless of whether or not they affect the opinions expressed in this opinion letter.

We hereby consent to the filing of this opinion letter as Exhibit 5.1 to the 462(b) Registration Statement and to the reference to our firm as counsel for the Company that has passed on the validity of the Units and Warrants appearing under the caption “Legal Matters” in the prospectus forming part of the Registration Statement or any prospectus filed pursuant to Rule 424(b) with respect thereto. In giving this consent, we do not thereby admit that we are within the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations of the Commission thereunder.

Very truly yours,

/s/ White & Case LLP

White & Case LLP