In Betaflight Configurator, check the Presets tab for your specific VTX model (e.g., Rush Tank, TBS Unify).
Defines available power output, mapping mW (e.g., 25, 200, 800) to dB values. Why You Need Them
Download the VTX table from the manufacturer's website and use the "Load from file" button in the Video Transmitter tab.
Maps channels (e.g., A1, R7) to specific frequencies (e.g., 5865 MHz).
Without a correct VTX table, you cannot change your video channel or power output via your radio (OSD/stick commands). If the VTX table is wrong, it may revert to default settings (often 25mW) every time you plug in your battery. How to Configure VTX Tables (Betaflight)