Here is the stock firmware for NEO X8-H PLUS,
the PC USB burning tool is included in the package.
If anyone needs access to recovery menu (the dead robot screen), it’s recommended to update to this build.
The tool should have installed the device driver for you during its installation unless you rejected it.
To enter the flash mode you need to press and hold both the power + recover buttons with the OTG cable connected to the PC.
Please click the link: Minix NEO X8-H Plus Stock Firmware