Samsung S7, S7Edge DRK & Root Solution
Device Root Key This Happen with Rooted Device, like S6/S6 Edge, S6 Edge plus, Note 5, S7/S7 Edge etc.
Afetr flash rooted Device it will stuck on start up with “dm-verity
verification failed…” ..need to check DRK first… picture above.
is a device-unique asymmetric key pair that is signed by Samsung’s root
key through an X.509 certificate. This certificate proves that the DRK
was produced by Samsung.
HOW TO FIX.
1st Download twrp of you Model from above Link
Flash twrp using odin Learn how to Use Odin From Here
wipe data Factory reset
install Samsung S7 DRK Fix download from here
again wipe reboot again twrp recovery mode
install BETA-SuperSU-v2.71 download from here
Also Root Successful