Android 7.1.2 (Nougat) remains the sweet spot for many legacy MXQ Pro 4K boxes. It offers:

Re-download the firmware and try another SD card, as some cards are not compatible with the bootloader.

This usually means the firmware version didn't perfectly match your internal hardware chip (e.g., RTL8188 vs RTL8189). If you'd like to proceed, I can help you:

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The file should usually be in .zip format (e.g., update.zip or s905w_7.1.2_firmware.zip ).