How do I undo an iPhone software update?
I allowed my iPhone to update to iOS 12.1 but was unaware that the new software would not sync with my MacBook, which is running El Capitan. I cannot run newer than this on the book so I need to take my phone back to an older iOS.
I can’t see how I can run a factory reset as iTunes doesn’t see the phone anymore.
Can anybody help with this conundrum?