If you flashed the wrong firmware, the box might not turn on. However, it can usually be fixed: Open the box and find the NAND flash memory chip.
A forum dedicated entirely to Android TV boxes and media players. mxq pro 4k 5g android 11.1 firmware download gratis
Furthermore, "MXQ Pro 4K" is not a single brand. Dozens of generic factories manufacture these boxes using completely different internal components (chipsets). How to Identify Your Real Chipset If you flashed the wrong firmware, the box might not turn on