i have tried all things but i am also not getting my setting done. except one thing which is upgraded OS. but i am aware that if my phone get locked or i will be unable to install new firmware. i dont know which firmware i have to install after 4.2.2. and i have not tried that before.
I would not upgrade to kk 4.4.2 to fix this issue, I personally would look into changing radios, you might also try doing the SIM unlock tutorial look for the part about making APNs stick.
Are you sure you have root permissions? confirm with root checker, root with ioroot if not
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