x27/openscanner ? reverse-engineered prompt

Build me a custom firmware project for Uniden scanners that keeps the official scanner behavior but adds the OpenScanner tweaks from the README.

I want it to support the models listed there, let me load a modded firmware, and keep the versioning and revert path sensible so I can go back to official firmware if needed. The main thing I care about is decrypting encrypted voice channels when I already have a valid key, plus the convenience improvements like better key mappings, no band gaps, extra system and site info, stronger debug logs, optional unmute for encrypted traffic, showing the encryption algo and key ID, RSSI on supported models, LED alerts during digital voice, a 5 percent dimmer option on SDS100, and longer replay duration.

If there are model specific differences, handle them cleanly. Make it easy to build and update, and if you need current Uniden docs or tool details, look them up online.