Just an ordinary backup. I simply deleted the GO app on the phone, connected to iTunes, clicked Install for the GO app, and synced. Since I hadn't done a backup since the auto-install of 2.5.0, my iTunes still had 2.4.3.Was it a full encrypt ITunes backup that gave you back 2.4.3?
I.
I have also been keeping the old versions of GO in a folder so I can go back to them if necessary. They appear in Music>iTunes>iTunes Media>Mobile Applications. Just copy the GO app to another folder. This only seems to work if you update your apps via iTunes on the computer. If you update them on the phone, the apps in the above folder don't get updated.
The last 3 updates of GO have all crashed when I first tried to use them. I deleted and re-installed them, then they would work.