I recently got a Mate 20 Lite. After a factory reset for my own use, I have to enter a PIN / a previously registered Google account. I can no longer reach the seller. How can I avoid that? I have no problem playing around with software a bit, but I have no idea where to start. Every Google search only gives the answer to a forgotten unlock PIN with reset, but mine is still there, even if I reset the phone. Probably theft protection, but now I have the problem.
Dispose of properly.
Wouldn't be theft protection if everyone could bypass it. The function where the Google account is not deleted in the factory settings is called FRP - Factory Reset Protection.
I saw that there are so called FRP cracking tools. Do you have experience with that? I do bad when it comes to downloading dodgy software.
No, take a look at XDA-Developer and read the articles.