dm-verity verfication failed

Hi,

I bought second hand Galaxy S7 (SM-G930F), first time I tried to enter the recovery mode I got error something like DRK failed. I ignored it.
Then following step by step instructions I installed TWRP.
And flashed custom rom SuperMan-Rom V1.6.5.
Everything was fine until I disabled heads-up using the ADB:

Code:

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adb shell settings put global heads_up_notifications_enabled 0

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After that I rebooted the phone for heads up to be disabled, but I got only Samsung logo and:

Code:

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Custom Binary Blocked By FRP

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I found on internet that I should reflash stock rom. Using the SamFirm v0.3.5 I downloaded G935FXXU1APE9 stock firmware (same one that SuperMan-Rom V1.6.5 is based on). Flashed it, but I got the message on the first startup:

Code:

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dm-verity verfication failed
Need to check DRK first

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And now I'm stucked into Android Recovery.
Tried to back to stock using Samsung Kies (Firmware upgrade and initialization) but I got the same error.
Apart from Android Recovery I also have the Download mode working.

If anybody could help?

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