I am not a lawyer, this is not legal advice, as should be obvious by me being a random dude on the internet.

• you can kind of sue about breaches of contract, but that’s civil law, not criminal law, so not illegal
• unless I profit from that or use it to defame <redacted>, they might have a hard time demonstrating their damages from that breach
• I didn’t sign any contract with <redacted> over their firmware anyway, and it will be hard to prove for them that I did, so kiss my ass
• I’m not in the US, neither is <redacted> so the DMCA can kiss my ass as well
• there are people who do this kind of work above-board, mostly in academic contexts, with their name attached to it, and as far as I can see they still walk around freely