The access to the service menu was deactivated in the production models. The method shown on the youtube videos does not work. Evidently, Qixiang does not want end users who don't know what they are doing bricking their radios, which I understand, but preventing any way to calibrate frequency is going too far. As any radio ages, even if its on frequency when new, it will need small calibrations over time.
If Qixiang doesn't want us in the service menu, and I don't blame them, they need to at least add a menu function where the frequency calibration can be fine tuned. This is literally the only radio in the history of radios where there is absolutely no way to calibrate the frequency. There are no trim pots inside the radio, so software is how they would have to do it, like how the Icom 7300 does it. I'd love to see a firmware update giving us this feature, even if it only gives us +/- 100Hz from the factory calibration, that would be enough to properly dial it in.