Forgot pin to decrypt volume on Lineage

casxa said:

Last year I installed LineageOS on a S9+ (now discontinued) and I encrypted the device. Now I have completely forgotten the pin to decrypt it, so it returns a message which states it will wipe all my data after some failed attempts. How to solve this problem before it's too late? Can I reset the attempts count, change the pin or backup the encrypted data?
The good news is I can access TWRP (v3.4.0) recovery mode. I read some tutorials, but I shouldn't remove decryption by cleaning the partition. Unlike normal boot, can I try to decrypt it as many times as I want, until I retrieve the pin, without worrying about my data being automatically erased? What if normal boot won't recognize the correct pin after recovering/changing it from TWRP? Do you know any terminal commands to execute the above tasks?

Go into TWRP.
Click the file manager.
Now go to data/system and find "locksettings.db" and delete it.
Reboot phone and see if pin is gone. If not.
Beck to TWRP. Back into data/system. And delete all of these and anything else that starts with "locksettings" that I forgot.
"gatekeeper.password.key
-gatekeeper.pattern.key
-locksettings.db
-locksettings.db-shm
-locksettings.db-wa

Reboot and pin should be gone.

Look into these as well.

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