There is no single "best" firmware, as compatibility depends heavily on your specific board revision and Wi-Fi chip. Firmware Type Key Features Pure Media Center
: These are "clean" versions of Android that remove manufacturer bloatware, optimize RAM usage (up to 100% optimization in some versions), and often include pre-installed essential apps like Netflix and YouTube. LibreELEC / CoreELEC
Open the box (carefully pop the rubber feet and unscrew). Look for printed text. You need to know:
Open the Batch Tool and select your .img file. Enter Maskrom Mode: Disconnect power from the MXQ 4K.