The open-source firmware that runs the Flipper Zero's Sub-GHz app: Read (decode a known protocol), Read RAW (capture an unknown signal as raw timings), Save and Send (replay/emulate a saved signal), and a manual virtual-remote builder. The official firmware deliberately refuses to save or replay rolling-code signals (e.g. KeeLoq) as a built-in safety limit — capture-and-replay works on fixed-code devices, not rolling-code ones, on stock firmware.