This process is irreversible. Flashing an FTF to remove a lock erases everything:
Yes. Flashing a full stock FTF with WIPE USERDATA completely removes the previous Google account token. Your G3311 will act as a brand-new device after the flash. sony g3311 lock remove ftf
There is no known method to remove a screen lock on G3311 without wiping /data because: This process is irreversible