Help, k1 max, error 2521

Hi, I’m desperate. I’ve tried adjusting all the connectors and it still doesn’t work.
It’s new, it was calibrated correctly the first time, then it was updated and then the error appears when recalibrating.
is it a software problem? return to factory software? do you have to root to return? if you root, do you lose the warranty?

Thank you very much and sorry for my English

Up, help pleased