My android keeps telling me my lock password is wrong but it's correct

Question

After rebooting my rooted, unencrypted, android phone, the lock screen keeps telling me my password is wrong. But I am very sure that the password is correct. Because I input this password once per day. I have adb debug enabled and I can connect this phone to computer, what can I do now? I don't want to reset my phone, that will lose my data. Thanks a lot.


PS: Another weird thing is even if it keeps telling me my password is wrong, after attempting this correct password many times (more than 30 times, I didn't count), there is no password failure attempts warning at all.


— sgon00 | Sources

Answer

I found a working method in XDA article 1 and XDA article 2. It's lucky that my android phone is rooted, so I can simply remove the key files and reboot :


adb devices

adb shell

su

rm /data/system/*.key

rm /data/system/locksettings.db

rm /data/system/locksettings.db-wal

rm /data/system/locksettings.db-shm

One more thing which bothered me is I have no ideas what the problem really is at the beginning. I did see some online questoins regarding the same issue such as link, but so far, no one can provide a logic explanation about this issue.


— sgon00 | Sources

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