[Q] 4 G LTE and 3G not working on Yureka topic

hi,

i bought a yureka, everything is great. its just that i'm unable to use 3G or LTE on my device.

it always shows edge. on my device. and runs 2G

in mobile networks preferred network type is LTE. and i have LTE service in my area.

on phone info *#*#4636#*#* By default the preferred network comes as LTE/GSM auto(PRL) and network type shows EDGE.
i have tried changing the preferred network to WCDMA preferred, then radio on/off, still network type shows as EDGE.

i have unlocked the boot loader and then flashed the modem (NONHLOS.bin) from Rohan A joshi thread in XDA yu yureka.

still im unable to use 3G or LTE.
the SIM is perfectly fine, if i put the SIM in some other phone like iphone, everything works fine.

can someone please help me :confused: i will be thankful.