FreakTab specializes in Android TV box firmware. The user “SuperUser” and “Mo123” often compile fixed ROMs for Rockchip devices.
Look for the full silkscreened model on the PCB, e.g.: Cv59sh-u32 Software Download
If your device still boots but is malfunctioning, back up the current ROM using Rockchip Batch Tool before flashing. FreakTab specializes in Android TV box firmware