In this situation, you need to either do a master reset, or to find firmware for your device and re-ask.
Regarding the total discharge it under your model - no information. But you can follow the general guidelines:
Turn off your device. You need to get in rekaveri menu. Typically this is achieved by simultaneously pressing several (usually 3, but may be two) keys: volume keys, menus, and inclusion. Try different combinations of their own.
When you see the rekaveri menu, find and select the item Wipe data / Factory Setting.
P.S. If you have picked up on our board combination to enter the rekaveri, please share these keys so that other users can easily use them.