iOS10 is ready for public download. pic.twitter.com/DnubO9FWHk— All iPhone (@iPhoneTeam) September 13, 2016
Warning: Upgrading to iOS 10 just fucked my phone. Now I need to factory wipe it, then 9.3.5. Then try again. Fuck. pic.twitter.com/SqkAfQCDsA— DHH (@dhh) September 13, 2016
Uh-oh! Some unhappy iPhone owners on the Twitter today. No way of knowing how widespread the problem is, but some iPhones are going into recovery mode after being updated with Apple's brand new mobile OS, iOS 10.01.
It shows that it's never good to ignore the "make sure to back up" message every time you update your OS. Incidentally, I just got through updating my iPhone 6s to iOS 10 with no problem.
UPDATE: Apple says the problem was caused by a temporary software issue on its end and everything should be groovy now.