[Q] can sum1 help me... cant upgrade my p6 to 708 topic

actually before im running on b704 3.0 then i tried to install b708 the repack version by oxalis dunno wats wrong coz it says i can flash it thru twrp. now cant go back to b704 coz i forgot to backup im currently on b635 repack version also. i never tried to install official version. thanks need urgent answers pls help.