Under section 1201 of the Digital Millenium Copyright, it would be illegal to install a custom ROM or repair your phone without permission from the manufacturer.
However, the Copyright office get to make official exceptions to the law and they made an exception for jailbreaking a phone. I'm not sure about repairing or installing custom ROMs. Those might fall into different categories.
However, the Copyright office get to make official exceptions to the law and they made an exception for jailbreaking a phone. I'm not sure about repairing or installing custom ROMs. Those might fall into different categories.