Same issue with iPad Pro. Bought it new about three years ago. Always used at home and lives essentially at my desk (I use it as an illustration/drawing tablet) and I've always been very, very careful with it. No drops, no bumps, nothing. One day it was perfect and running, next day stuck on Apple logo loop. Tried contacting Apple support because my Macbook wasn't even recognising the iPad. They managed to help with that after a lot of tweaking, but then after it connected, when trying to update via Macbook, I got this error message indeed, which obviously no one wants to see. I have cloud backups from most things but have not done backups for Procreate and a couple of other apps in three months. I'll be losing so much work and data.. from personal to professional data (it's really stupid as well, that in this day and age, despite one paying a lot of money for iCloud or other cloud services some apps still don't/can't use it for backups - its beyond idiotic). And now, after searching online it seems this has been happening for a very long time and Apple just doesn't care? Even given that there are viable solutions? This is crazy!!