S7 Samsung g930t Oreo 8.0 version with network lock....when try to downgrade with any file it says sw rev cheak fail mean I can Flash latest file but can not flash lower version file 7.0 or 6.0 and without downgrade it's not possible to unlock.........any one have idea to turn off secure download and downgrade phone........ conclusion I want to know how to downgrade without sw rev cheak fail error..
