Samsung G935FD Cant Remove FRP or Downgrade

Somehow, from yesterday and the day before it :D
I cant defeat FRP on G935FD (which installed oreo).
I can only downgrade to 7.0 patch april 2018
Not work patch before april, january-fabruary-march failed.

This patch (april) i can't bypass through
- bluetooth
- realterm
- talkback
- adb enable file (hang on logo)
- combination fw (only COMBINATION_FA60_G935FXXU2ARA1, patch january 1, 2016), can't downgrade again to previous combination

all methods has been tested. Could someone help me on this problem?

i am on = G935FXXS2DRCE_NZC2DRAC 7.0

Thank you,