# Adding additional frequencies (TX/RX) Official firmware now uses a different method for region locks. Per Aleksandr Kutuzov (skotopes): ``` Mobile app uses Phone/SIM region with fallback to GeoIP. Desktop uses GeoIP and fallback to System. ``` This data is stored in the `.region_data` (hidden) file within internal storage and is set when connected to Desktop/Mobile per above.<br> If you're having issues with regional retrictions that do not match your region, you can use the `region_data_null` file here.<br> Simply download and rename it to `.region_data` then replace the one currently in your internal storage. NOTE: This _will_ be overwritten each time you sync to the mobile app or qFlipper! **Use strictly for testing/verification purposes.** ## Note: You must be on the latest release! 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))<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.<br> RogueMaster allows unofficially supported frequencies with the `extend_range` 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 some code and recompile if you want to break outside of the officially supported frequencies. [Proceed with caution.](https://github.com/UberGuidoZ/Flipper/blob/main/Sub-GHz/Restaurant_Pagers/SubGHz_changes.md) # CAUTION within 402-408 range!<br>Medical devices can operate here. ## This range is purposefully not included in my file above. ----- I've had so many asking for me to add this.<br>   **BTC**: `3AWgaL3FxquakP15ZVDxr8q8xVTc5Q75dS`<br> **BCH**: `17nWCvf2YPMZ3F3H1seX8T149Z9E3BMKXk`<br> **ETH**: `0x0f0003fCB0bD9355Ad7B124c30b9F3D860D5E191`<br> **LTC**: `M8Ujk52U27bkm1ksiWUyteL8b3rRQVMke2` So, here it is. All donations of *any* size are humbly appreciated.<br>   Donations will be used for hardware (and maybe caffeine) to further testing!<br> 