Put the MXQ Pro into Maskrom or Loader mode (usually by holding a hidden button inside the AV jack) and flash via a USB Male-to-Male cable. A Word of Caution
This gives you:
The is a workhorse once you strip away the factory junk. By using a firmware repack, you can turn a $25 paperweight into a snappy 4K streaming machine. Always back up your original firmware if possible, and proceed with caution! mxq pro 4k rk3228a firmware repack