The MXQ Pro 4K has many hardware versions (e.g., S905W, S905X, S905D, S905L). Installing the wrong firmware can permanently brick your device.
The progress bar will turn green as the ROM transfer begins.
This is a simpler method if your box is still functional and has a "Local Update" app. Format Drive : Use a FAT32-formatted USB flash drive. File Placement : Create a folder named MXQ_4K_Update
Have you already identified the inside your box to ensure we find the exact firmware match?
Here’s a helpful, verified guide for updating the firmware via USB.