N910A DM verity failed Help

Today I flash one n910a with 4 file firmware 5.1.1 but after flash it will rebooting at updating apps i saw in recovery it says DM verity failed
Wipe data and cache not help to get out of this
I also flash without csc file because it contain cache.img which causing this but after flash without csc file immediately going to recovery there is no error dm verity fail but when i reboot the phone it restart at updating apps after that on recovery dm verity failed what is the issue
Please help

Shahzaib Jahangir