My iPhone 4s is around 10 years old. I use it daily. It was on iOS 9.3.6. I wanted to downgrade to iOS 6. I installed Phoenix jailbreak and then put it in KFDFU and flashed 3utools IPSW.
But the flash failed and iPhone was not getting recognised back. I waited for 3-4 hours then I decided to unplug and plug it back, still no success.
My iPhone is now stuck in iOS 6 logo with a progress bar. Home button is broken; I used to use assistive touch with it. I took backup of the phone on my MacBook but the phone is not getting recognized by MacBook.