iOS 12 is way too new. I have a Retina iPad stuck on iOS 9, which is now essentially an ebook reader and movie player. I had two of them stuck on iOS 5. Perfe

iOS 12 is way too new. I have a Retina iPad stuck on iOS 9, which is now essentially an ebook reader and movie player. I had two of them stuck on iOS 5. Perfectly working, cosmetically perfect, lots of battery life, but bricks. Whereas I have a 1st gen Pro and a 5th gen (when the stock iPad got the Air form-factor) which both run the latest iPadOS, but their battery life is now a couple of hours if that. They're nearly useless. I had a new battery fitted to the 5th gen. It is no better but now the screen is damaged with multiple artifacts visible. There is no battery replacement for the Pro: it's too big and too fragile. In other words, in important terms, the old ones were BETTER but they are now useless because of an outdated OS.