(But be warned, flashing this firmware at your own risk...)
Use the Amlogic USB Burning Tool to flash .img files directly from a computer using a USB-A to USB-A (male-to-male) cable. Critical Precautions tx9 pro android tv box firmware link
Standard tools for Tanix devices include the Amlogic USB Burning Tool or PhoenixSuit . Tenda (Networking/Router Version): Global Version: Firmware version 22.03.02.09 for the (v1.0) is available on the Tenda Global Support Site . (But be warned, flashing this firmware at your own risk