S6 Edge+ G928C Reset FRP, Reactivation Error

G928CXXU2BF5 6.0.1 Reset FRP, Reactivation Lock Error:

Operation: Reset FRP/React/EE
Selected model: SM-G928C
Software version: 26.0

Searching Samsung USB Flash Interface… detected COM7
Setup connection… OK
Reading PIT from phone… OK
Searching FRP lock… OK
Erasing FRP… OK
Searching Reactivation lock… OK
Erasing Reactivation lock… error

Done with Samsung Tool PRO v.26.0

I think I need to downgrade the sboot first as in the case for G925T, but couldn’t find the sboot file. Anyone has the sboot file, please share, thanks