Look for a white silkscreen text: or V3.1 or V5.1 . Also note the Wi-Fi chip:
Is your device currently or the logo screen ?
Downloading and installing the firmware on your MXQ Pro 4K is a straightforward process that can be completed using an SD card. Here's a step-by-step guide:
(usually hidden inside the AV port). Use a toothpick to press and hold it while plugging in the power cable.