Since there is no single "official" manufacturer website for these generic Android boxes, the community relies on trusted firmware repositories. Here are the most reliable sources for the TX9 Pro:

: These often use Allwinner H313 or H616 chipsets and may claim "Android 12/13/14" on the box while actually running older versions. Always try to use official sources first: Tanix TX9 Pro Android TV Box Unboxing and Mini Review

Take a high-resolution photo of the motherboard before searching. You will need to match the Wi-Fi driver string exactly.

: Mirrors of previous versions like V22.03.02.09 can be found on the Internet Archive . Manual Installation Methods

Disclaimer: Flashing custom firmware voids your warranty and carries a risk of permanent damage. This guide is for educational purposes. Always verify your hardware twice before proceeding.