g920t 5.1.1 dojc unlock failed octoplus 2.2.1

i did the factory reset, flashed stock 5.1.1 dojc, rooted with cf auto root and wrote the security backup. but still no unlock

Unlocking phone…
Deactivating MSL…
Executing exploit…
Executing exploit failed
Phone unlocking failed
Performed by 2.2.1 software version


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