onda v989 allwiner a83t octa core 32gb bootloop beacause i installed chainfire 3d :( i cant fix it, please help i have onda v989 allwiner a83t octa core 32gb bootloop beacause i installed chainfire 3d :( i cant fix it, please help please, i need it so much. my FBgmail: huynam371@gmail.com . plese help me!!!! text me some mess or teamviewer for helping !!!! thanks a lots ..... i dont know too much about my tablet. i cant use adb shell, i typed "adb sideload [rom.zip]" and i got at all: e footer is wrong .................
You just need to flash the stock firmware (ROM) for your tablet, this will overwrite all modified system files. 
Since it is powered by Allwinner chip, you need a tool called PHOENIXSUIT (in English) or ONDASUIT (in Chinese) to flash the image file. Click this link to get the flash file (ROM image). Don't forget to unzip first.