Enable OEM unlocking in Developer Options, then run:
While fastboot flash-all.bat is efficient, it’s not the only method. fastboot flash-all bat
To update your phone without losing data, edit flash-all.bat in Notepad. Find the line containing fastboot -w update . Remove the -w so it becomes fastboot update . Save and run. This can cause system instability if major partition changes exist between versions. Enable OEM unlocking in Developer Options, then run: