You can lock the device to a subset of its supported frequency bands on LTE, WCDMA, or GSM . Note that this operation will result in no service if you prevent the use of all bands that are available at the current location.
Read moreHow do I lock my signal to single band in LTE?
To find, lock, or erase an Android phone, that phone must: Be turned on.
Read moreHow do you unlock all bands on Android?
Type in *#*#SERVICE#*#* (*#*#7378423#*#*) to see your new bands that your phone can use! If your phone can’t boot then flash stock FTF to your device and you should have your reception back!
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