what about sm-G920f DRK repair?

When go to recover mode, it shows dm-verity ………… failed.
But when power on the phone it shows at startup (Kernel is not Seandroid Enforcing) and then phone start up normal and restarting automatic after few mints, and no code working on phone, like *#06#,
*#0*#
*#0808#
*#1234#
Etc……..

Need help in repair
Thanx