They might be able to, but, if they are effectively saying "our product is broken and you can't use it until you do X" they could be responsible for massive contractual liabilities.
I haven’t heard of any similar successful court cases in recent years in the US.
For USA [4], Title 14 of Code of Federal Regulations, Chapter I Subchapter C, Part 39
For EU [5] Article 76 (6) of the Basic Regulation (EU) 2018/1139
[1] https://www.icao.int/publications/pages/doc7300.aspx [2] https://ffac.ch/wp-content/uploads/2020/09/ICAO-Annex-8-Airw... [3] https://ffac.ch/wp-content/uploads/2020/09/ICAO-Annex-6-Oper... [4] https://www.ecfr.gov/current/title-14/chapter-I/subchapter-C... [5] https://www.easa.europa.eu/en/document-library/regulations#b...