Once I know this, I can help you find the right VTX table or tell you how to set it up. How to configure VTX tables for drone? - Facebook
Newer VTXs use SmartAudio 2.1+ (power in dB), while older ones use 2.0 (power in 0-3 values). vtx-tables
Download the VTX table from the manufacturer's website and use the "Load from file" button in the Video Transmitter tab. Once I know this, I can help you
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
Copy and paste the manufacturer-provided VTX table text into the Betaflight CLI.
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)