Szymon_Orthodox The bootloader is the very first program that runs when you turn on your phone.
By default, the bootloader is locked, which ensures the normal state of the phone. Having it unlocked it’s like having your phone in developer mode, so Google assumes the device may be tampered.
You can check if your phone has this bootloader unlocked by enabling “OEM unlocking” from the Developer settings. And from there you can connect your phone to the PC and run some commands to verify if its bootloader is locked.
TLDR; If the bootloader is locked: good. If it’s unlocked, it breaks integrity.
If you want, we can guide you through the process of checking this. It’s a little bit technical, but nothing crazy
