unleashed-firmware/documentation/DangerousSettings.md

How to extend SubGHz supported frequency range

CC1101 Frequency range specs: 300-348 MHz, 386-464 MHz, and 778-928 MHz

This setting will extend to: 281-361 MHz, 378-481 MHz, and 749-962 MHz

1. Please do not do that unless you know what exactly you are doing
2. You don't need extended range for almost all use cases
3. Extending frequency range and transmitting on frequencies that outside of hardware specs can damage your hardware!
4. Flipper Devices team and/or unleashed fw developers is not responsible of any damage that can be caused by using CFW or extending frequency ranges!!!

If you really sure you need that change, find subghz/assets/dangerous_settings file on your microSD, read comments on first lines and change false to true