for gsm simply set your device from NV_ONLY to RUIM_ONLY see below pic

[Only registered and activated users can see links. ]

and there is no programming when you do this because it sets the device to read from the sim card only so you will need an active sim card in the device or else your wasting you time,if the device rejets the sim after you do that then the modem needs to be unlocked first then retry.
if you are using non lte then use gsm only