If the device will not boot at all, you may need to use the (for Windows).
For the Allwinner H3 chipset found on this board, the standard tool is . firmware tv box mxq pro 4k 5g placa h3q44-v3.0
Before flashing anything, you should dump the original firmware. If you brick the box, this is your lifeline. If the device will not boot at all,
Before flashing, verify these internal details by opening your box: H3Q44-V3.0 (also commonly seen as Q44-V3.0). Processor: Allwinner Tech H3 @ 1.1Ghz. WiFi Chip: Often uses the SV6256P module for 5G support. If you brick the box, this is your lifeline
To help you find the exact file, do you know if your board uses a or Allwinner processor (it’s the large square chip in the middle)?
Look specifically for ROMs compatible with the H3Q44-V3.0 or H3 Allwinner series. Step-by-Step Flashing Guide MXQ Pro 4K 5G (H3 Allwinner) [Android] - 4PDA