Download Android Pie 9.0 new stock firmware for MINIX Neo U22-XJ TV Box from here or here. Download previous firmware from here. Download Amlogic USB Burning Tool v2.2.0 from here or download Amlogic Burn_Card_Maker v2.0.2 from here.
Archive name: U22-XJ-V004-Android_9.0-20200602.7z
Archive file size: 617 MB
Model: MINIX Neo U22-XJ TV Box
Platform: AMLogic S922XJ
System: Android version 9.0
Build number: galilei-userdebug 9 PPR1.180610.011 20200602 release-keys
Caution Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data. BTW, a link doesn’t last forever.