1) Download the firmware that you want to install: DOWNLOAD
2) Make sure that the firmware is xxxxx.tar.xz,
3) Power-down the box in the power switch in the back,
4) Turn on the power and quickly press and hold the standby button, the standby light on the box will flash red/purple flashes and when the button is permanently red, please let it go,
5) Memorize the IP that appears on the TV screen,
6) Now on your web browser on your PC enter the IP of your box,
7) Now, press the "Firmware Upload" and Browse the firmware that you want and start the flash process.
8) Press Start and wait till it finish and then press "click here to Reboot" and it´s done.