swarnava dey :
will microsoft give an update for 4g lite . because it is providing an update to others also
No, the radio inside the phone is a GSM/HSPA radio, its not possible to software upgrade it to LTE. There are some devices that 4G LTE was not enabled in the phone, but the radio was there, software updates enabled it. This phone is not one of them.
HSPA is sometimes called 3.5G or 4G, its not LTE but it is faster than regular 3G.