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I have forgotten the PIN of a device but I do have access to a root shell with adb shell and su

Is there some way I could remove the screen PIN lock or change it?

2

if your device is not encrypted with login credentials you can delete locksettings.db

adb shell su -c "rm /data/system/locksettings.db*"

However, bear in mind the following files are required for FBE encryption. If you delete these files you won't be able to decrypt userdata partition, all data is lost

/data/system/gatekeeper.password.key
/data/system/gatekeeper.pattern.key
/data/system/locksettings.db
/data/system/locksettings.db-shm
/data/system/locksettings.db-wal
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2

The big axe

A brute force solution existed as I had access to fastboot too.

To remove the PIN, removed the entire userdata partition with fastboot

fastboot erase userdata

as described here: https://android.stackexchange.com/a/175887/320098

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  • To wipe the entire partition is pretty brute force to be - it removes everything – Simson Apr 27 at 10:45

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