BA4QNS If I'm not mistaken, the original version number should be v1.01.02.0010. The aviation frequency can only be set manually, and the writing software does not support it because it is unclear which chip it uses (I also don't know which one I have now). When I saw 1.01.03.0005, I thought there was a new firmware version, so after flashing, simulating reception became problematic. After reverting to 1.01.02, the aviation frequency no longer requires manual setting. This is frustrating. Some domestic brands' writing software and firmware are also unavailable for download from their official websites. It's unclear why they hide this information, which is not friendly to enthusiasts at all.