This suggests the firmware flashed correctly, but the display resolution is incompatible. Try a different HDMI cable or monitor.
The (and its variants) is one of the most common budget Android TV boxes on the market. However, because so many manufacturers use the same plastic casing, the internal hardware varies wildly. mxq rk3229 emcp v31 firmware link
Note: Always scan downloaded .img files with antivirus software before proceeding. This suggests the firmware flashed correctly, but the
While holding the button, connect the box to your PC via a (usually the OTG port, which is USB port #4). This suggests the firmware flashed correctly
Once you have located your link and downloaded the image file, follow these steps: