NOTE: In my experience, this did not overwrite the stock recovery and I was unable to get the System partition to mount
Things You Will Need
Preparation and Booting Stock Recovery
Copy the downloaded .zip file to the microSD card Safely eject the microSD Unplug power from the TV box Plug the microSD card into the Tanix TX6 TV box While holding the reset button on the TV box (on the back beside the two USB ports) with a toothpick or unfolded paperclip, plug in the power cord Continue holding the reset button for 10-15 seconds The stock recovery should load
Running TWRP Recovery
With the device in stock recovery, select Appy update from SD card from the main menu Select the downloaded TWRP_TX6.zip TWRP recovery should load