1. try entering null as password.2. try entering your username without @
gmail.com3. Combine 1 and 24.
Call yourself from another phone, answer, without hanging up press the
home button, then menu button, settings, try to disable pattern-lock5.
Call yourself from another phone, answer, hang-up, directly after
hanging up start pressing your buttons like a madman for <30-60
seconds ending with your home button (might take a while to get the
timing right). Go into settings and disable pattern-lock.6. Try the normal recover password routine from GMail.com
7. Perform a factory reset. YOU WILL LOOSE all not-synced DATA (SD card will be left untouched).
1-6
are possible workarounds, these doesn't work for everyone but can be
worth a try to avoid factory reset. 6. is what should work but hardly
never does. 7 - The factory reset always work
Added reference with some additional info, how to factory reset can be found there.Good luck!
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