Boot into twrp...then wipe system dalvik data cache and/or internal storage....then flash your backed up 6.0.1 stock ROM...now every thing will be fine...To restore my back up of stock 6.0.1 from custom 7.1.1 using twrp, do i need to wipe anything? I am stuck at boot logo when i tried to restore my back up after wiping system, data and cache. I tried to return to stock from custom 7.1.1. Where did I go wrong?