CANNOT CHANGE THE PREFERRED NETWORK TYPE

ZF Model: ZB631KL
RAM: 4G
Firmware/APP Version: OPM1.WW_Phone-15.2016.1812.179-20181227
Frequency of Occurrence: -
Rooted: No
APP Name:

After the december update...the phone preferred network type cannot be change to LTE ONLY using the phone (*#*#4636#*#*) setting...it will return to default setting even if i pick the LTE only mode...before the update i can use the lte only setting without any problem

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