open mo recovery mode, usually power button + volume down pipindutin mo ng sabay, basta nasa recovery mode ka na may option ka dun para mag reformat, kelangan tanda mo nakalog in na google account btw para wala problem. If di gumana, most likely bricked na yan, kelangan mo na yan reprogram/reflash using either pc or sd card, search mo na lang ang process sa net kung pano kasi minsan iba iba ang process depende sa phone. Don't worry kung factory/manufacturer/stock rom gagamitin mo sa pag reprogram di mo na need iunlock OEM/bootloader didiretso yan basta di sya cutom rom. This should fix your problem unless na nasira ang mmc mo. Do note that you will be downloading the rom which would be 2gb+