I once tried to do a relatively basic repair on a phone, and ended up really breaking it. Like the touch screen won't work because I broke some shit on the motherboard that now requires micro soldering broke it.

So I send it to a repair company that allegedly does some micro soldering, and they call me to tell me they can't repair it because their diagnostic utility doesn't work unless it's the stock OS (I've been a GrapheneOS user for many years). What they do is... wipe my data and then tell me it's not the screen so they can't repair it.

Then I sent it to an actually good repair shop and they fixed it very quickly, easily understanding the problem. Good repair companies aren't easy to find but damn are they worth it. They're almost always smaller shops and they do not GAF what you do with your phone's software.