Dial *#06# . Your IMEIs should be restored. If you see "Null" again, you have a hardware NVRAM corruption requiring a full "NVRAM backup restore" (advanced).
: An official-grade utility used for MTK smartphones. It works in META mode and is highly effective for flashing, writing, or fixing IMEI data on Xiaomi devices. xiaomi imei repair tool mtk
: A popular professional software that allows for "IMEI Patching" on various Xiaomi MTK models by connecting the device in boot mode. Unlock Tool Dial *#06#
Because repairing IMEI without authorization is illegal in most places. But sometimes, legality bends for a kid who just needs to call his mom. xiaomi imei repair tool mtk