v.3.3.0 is a common stable version found on the Tanix TX6 4PDA thread.
Hold the button (often hidden inside the AV port or a small pinhole) using a toothpick or paperclip. phoenix usb pro 4pda link
According to guides on 4PDA and manufacturer manuals , follow these steps to flash your device: Open PhoenixUSBPro.exe . phoenix usb pro 4pda link