Carrier unlock right, and error after flashing original firmware from SamMobile?
With original firmware you flashed (Odin) you shouldn't need basebands/kernels here. These phones apart from unlock code errors working?
Yes, T-Mobile carrier unlock codes are not working. The phones are both GT-i8190 one with CM12.1 and other with stock ROM from SamMobile - working perfectly.
I used SkipSoft Unified Android Toolkit to originally root/flash but now I use Odin or TWRP depending on what I need to do.
Edit: I flashed 2015-08-10; Croatia (T-Mobile); I8190XXALJL; I8190CROALK2 Firmware from SamMobile and still doesn't work.
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