[HELP] - SM920AUCU7 back to stock ROM

i use this combine file
than cant back to stock ROM


ill try to write this file


and this one (but FAILED)


now this phone bootloop with green word


and ill try flash sbooot.bin from combin UCU7 file but still bootloop green word
still showing.
this phone cant boot to recovery mode.

try ota update by smart switch, but he say unsupport device


when device running with combine file UCU7
[smart switch say unsupport device]


z3x team, gsmforum friend, please help me to fix this device

Thank You.