You must use Amlogic USB Burning Tool v2.2.0 in order to manually install the NEO U22-XJ firmware.
Amlogic USB Burning Tool v2.2.0 is available to download from below link:
https://files.theminixforum.com/shared/tools/Amlogic-USB_Burning_Tool_v2.2.0.zip
Amlogic USB Burning Tool v2.2.0 is available to download from below link:
https://files.theminixforum.com/shared/tools/Amlogic-USB_Burning_Tool_v2.2.0.zip