Use for all S9/S9 Gen2 devices. Avoid v3.x unsigned builds from unknown sources. Always backup original firmware ( aml-flash-tool read on Linux) before writing.
I can provide specific instructions or find the correct for your hardware. amlogic burn tool
Manually installs newer versions of Android or Android TV. Use for all S9/S9 Gen2 devices
A high-quality USB-A to USB-A (Male-to-Male) cable is usually required. amlogic burn tool