Toqeer Taqi replied at 2019-05-03 12:59:34
It doesn't work on the MI 9 and MIUI on my phone isn't designed to allow a change. The network settings in MIUI where you select your preferred network show no selection after you make a change in the test screen because the MIUI interface isn't compatible with making any changes there. As soon as the phone is rebooted it reverts back to the settings that are programmed into the firmware. Maybe the Redmi phones work differently.