Optional Flipper diagnostic receive preset.
Back up any existing /subghz/assets/setting_user and preserve personal settings.
If no file exists, copy the included setting_user there. Otherwise append only
its Custom_preset_name/module/data block and add Frequency: 433550000 if absent.
Reopen Sub-GHz, select Efergy_FSK_v2 and 433.550 MHz in Read RAW.
Record for 60 seconds. This is the preset tested in the project, with no
guarantee of compatibility with every Efergy variant.
