Easier for non-experts:
This works only if tablet can enter Fastboot or is recognized by LMSA.
This paper examines firmware for the Lenovo Tab M8 (model TB-8505X): available builds, sources, update methods, common issues, verification and security considerations, and recommendations for safe firmware management. The goal is to provide a concise, practical reference for technicians, advanced users, and researchers.
In most regions, yes. However, re-locking the bootloader and flashing official firmware can make it undetectable.