Samsung Tab E SM-T377T successfully unlock with Octoplus via downgrade from Naugat 7.1.1 to Marshmallow 6.0.1...
**Download and Flash the phone with firmware android version 6.0.1 USA T-Mobile...
**Select AP, CP and csc... and flash it to any samsung flash tool...
**After flashing,, direct unlock using octoplus samsung and wait phone successfully unlocked.
+++Firmware does'nt exist on support... please PM me if you need this file+++
***please visit here for more photos***
https://www.facebook.com/gfc.reyabueva
Regards'
GFCozamiz
**Download and Flash the phone with firmware android version 6.0.1 USA T-Mobile...
**Select AP, CP and csc... and flash it to any samsung flash tool...
**After flashing,, direct unlock using octoplus samsung and wait phone successfully unlocked.
+++Firmware does'nt exist on support... please PM me if you need this file+++
***please visit here for more photos***
https://www.facebook.com/gfc.reyabueva
Regards'
GFCozamiz