Something else to note. When reverting to an earlier version of the ASIAir app, make sure you have also reset the firmware in the ASIAir itself.
While the ASIAir app will not work with firmware earlier than the corresponding version, it WILL work with later firmware.
For example:
It does not allow APP versions 2.4.x to run with with the FIRMWARE 12.05 from the app version 2.3.3; BUT
It DOES allow APP version 2.3.3 to run with the FIRMWARE 12.55 from the app version 2.4.2.
This is a potential trap - for example the meridian flip issue - it's the firmware which performs the meridian flips, not the app. Firmware 12.55 is buggy, while firmware 12.05 performs meridian flips OK.
So when you are reverting to an earlier version of the app, make sure you reset the firmware as well.