Q: How do I revert out of iOS 9 to the last version of 8 on my iPad 4 and iPhone 5???

SSince the release of version 9 iOS for iPads and iPhones, they have been nothing but bugged out trouble and have caused me more time trying to fix or work around all that had been corrupted or made errat by these so called upgrades. The first version of 9 sucked and had many problems, the. Came revisin 9.01 and it sucked less, but still sucked. Now as of today I've updated to 9.02 and it's even worse. My Siri doesn't work, my email is all screwed up as pages I type now scroll instead of staying full view, and quite frankly, I was very happy with version 8.? I was using and want to revert my iPads and iPhone back to version 8.?  How can I do this? Apple as usual doesn't answer their help phone lines, and there NOTHING on these website to explain how to revert back to a previous iOS. And this also *****!!! Apple thinks they are Gods gift, but they have been and always will be far from it. They just happen to be the only choice if you want these products, so they must feel they can treat people like me as **** and get away with it. Not happy at all and will do something quite drastic if an answer is not found or offered by an Apple IPad/iPhone tech support person ASAP!!!