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# Adding additional frequencies (TX/RX) [By UberGuidoZ](https://github.com/UberGuidoZ/Flipper/blob/main/Sub-GHz/Settings/ReadMe.md)
#Sub-Ghz Frequencies in Xtreme
Some changes I made to the available frequency settings (including unlocking them all). The file is found here:
Officially supported frequencies: 300-348 MHz, 387-464 MHz, and 779-928 MHz (from [CC1101 chip docs](https://www.ti.com/product/CC1101))
Unofficially supported frequencies: 281-361 MHz, 378-481 MHz, and 749-962 MHz (from [YARD Stick One/CC1111 Docs](https://greatscottgadgets.com/yardstickone/))
![Sub-Ghz_Changes](https://user-images.githubusercontent.com/57457139/174948988-f6955976-2318-4e3e-b658-93f0465bb22e.png)
Currently no other Flipper firmware allows anything outside of the officially supported CC1101 specs without editing files that get overwritten with every update.
Xtreme has these frequencies enabled by default.
Officially supported frequencies: 300-348 MHz, 387-464 MHz, and 779-928 MHz (from [CC1101 chip docs](https://www.ti.com/product/CC1101))<br>
Unofficially supported frequencies: 281-361 MHz, 378-481 MHz, and 749-962 MHz (from [YARD Stick One](https://greatscottgadgets.com/yardstickone/) CC1111 docs)
Official & Unleashed currently do not allow anything outside of the officially supported CC1101 specs.
RogueMaster allows unofficially supported frequencies with the extend_range.txt file
**NOTE: Going outside the supported frequencies may DAMAGE YOUR FLIPPER AMP.<br>
Please understand what you're doing if trying to break out of official frequencies.**
You'll need to edit the [extended range file](https://github.com/ClaraCrazy/Flipper-Xtreme/blob/main/documentation/DangerousSettings.md) to enable frequencies outside of the Official above.
# CAUTION within 402-408 range!<br>Medical devices can operate here.
This range is purposefully not included in my file above.
**NOTE: Operating outside the supported frequencies can damage your amp and may not provide the same results as supported frequencies.<br>
Please understand what you're doing if you transmit on unsupported frequencies as medical devices are licensed to operate there.**