I see Bambu allow downgrade right back to the early releases on my A1 . This is really good and able to be done from the app. I know all users are not, like us, able to compile OS kernels and flash usb boot devices to re-flash klipper instances so this actually beats apple, as they dont allow this 
My A1 today, after upgrade, has the new PA ams lite saving features for auto-cal, but, i’m having some strange quality issues and the printer feels a bit faster and slightly more juddery.
Seems to be printing (well accelerating and decelerating) a bit quicker this side of the fw update anyone else notice this. I did the same batch of stuff as I did yesterday and today after the update and there’s a noise (slight more clattery) increase . Havn’t moved it or changed anything else same filament.