I think the update was to fix the auto syncing of flight logs. My logs would not sync yesterday when using the 1.15.4 update. It's all fixed in the 1.15.5 update.
Cheers OMM. So update not applicable on the RC2 then? You have the Air 3 IIRC EDIT: just checked my RC2 for the Air 3s and 1.15.4 is the current firmware