Copy and paste the manufacturer-provided VTX table text into the Betaflight CLI.
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 vtx-tables
In Betaflight Configurator, check the Presets tab for your specific VTX model (e.g., Rush Tank, TBS Unify). Copy and paste the manufacturer-provided VTX table text
Newer VTXs use SmartAudio 2.1+ (power in dB), while older ones use 2.0 (power in 0-3 values). vtx-tables