I8200N can't unlock

trying to unlock i8200n by selecting i8200 many times but nt succeed here yhe log with NSPRO 6.7.6:



Waiting for phone...

Checking if phone is Rooted...

Root Access Granted!

Processing...

Connecting to phone...

Operation failed!

Phone is android 4.2.2 and rooted with vroot

Salam

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