Install or reinstall the firmware
Switch the main knob to off
Download the latest KPA firmware
Get an empty fat32 formated USB stick
Copy the unziped firmware file 'kaos.bin' to the root folder of the USB stick
Plug the USB stick into the KPA
Press and hold both '<' and '>' keys
while still holding both keys - switch KPA to tuner
Something like 'booting and installing' will be displayed
Wait until the firmware is reinstalled.