What (if any) are you getting from your flashing software? Let me know how you would like to proceed! Share public link
Even if you cannot backup, at least copy the dmesg log via a root terminal to identify the exact DDR and Wi-Fi chip.
This is why searching for "MXQ Pro 4K 5G firmware" on Google is dangerous. You must include in your search query. firmware tv box mxq pro 4k 5g placa h3q44-v3.0
Click on the tab located at the top navigation bar. Click the Image button.
Which (Allwinner, Rockchip, Amlogic) is physically printed on the center of your board? What (if any) are you getting from your flashing software
If the box turns on but hangs indefinitely on the Android logo, the firmware you used likely contains an incompatible bootloader or RAM configuration. You will need to source an alternative firmware revision built specifically for your board variant.
This board typically utilizes an Allwinner processor (often labeled or masked as Rockchip or Amlogic in software, but physically an Allwinner H3 or H616 variant architecture). This is why searching for "MXQ Pro 4K
The MXQ Pro 4K 5G is one of the most popular budget Android TV boxes on the market. However, because it is produced by various manufacturers using different internal components, flashing the incorrect stock firmware can easily brick your device.