How to retrieve data off of internal memory for LG Optimus (android 2.3.4), not rooted, locked via PIN password, and no forgot password showing up on PIN entry screen? I'm more particularly interested in contact data then anything else.
adb, you can use
adb pull to take any file you want from your phone, event if it is protected and locked (I tried on 4.1.2, don't know if it works on more up to date versions).
/data folder needs
root privileges to be read and it is where your contacts are stored. If you have
root privileges, you can look at this answer to know where you can find them.
Note that you have to enable USB debugging before trying these steps.
Why is there no "Forgot PIN" or a Mail recovery option there? :(
See if this app is compatible and use it:
If you have your contacts synced on your Google account, they will automatically get restored.
This might help you get the data back: