I bought a N920-T from shop which was Unlocked and Working for other carriers on Kit Kat rom.
I then installed stock Marshmallow using Odin/Rooted and TWRPD it. And it was fully working with my international SIM. I made a backup of my fully working unlocked Marshmallow with all the items checked (EFS and MODEM too).
Today, somehow my rom got stuck and crashed and I decided to Restore it using backup which I made. Restore got through and everything was back EXCEPT I see "Network Lock:" screen on first time boot up after restoring it.
"The device can be remotely unlocked if eligible. Please use "Device Unlock" application to unlock the device."
Please help! What should I do? Should I launch the T mobile device unlock application and continue it with wifi and see what happens?. Or what?. My device was unlocked and fully working on Kit Kat and Marshmallow too. It means it was officially unlocked right?. PLEASE GUIDE.:(