Default [Q] Help!! Admiral YF-1002 with Android 2.1 - "too many pattern attempts"

Hello to everyone! I need help with my tablet, Admiral YF-1002 with android 2.1, blocked by "too many pattern attempts".
I try login with my gmail account and nothing, and i'm trying to reset to factory default, but i can't.

- Press Home button and Power -> Nothing
- Press Back Button and Power -> Nothing
- Press Properties Button and Power -> Nothing

and any other combination -> Nothing.

Does anyone knows about how to factory reset this device?

It has Power, Back, Properties and Back Buttons.

Thanks!!!

Regards!

Gonzalo.