iPhone 6 stuck in recovery mode and need to download iOS 11 beta 1
If you need to switch out of recovery mode, use ReiBoot (www.tenorshare.com/products/reiboot.html). FOr .ipsw just find any .ipsw file adequate for you iPhone though. You need to look the number of your iPhone, for instance, my iPhone is iPhone 5s, hence it is iPhone 6,2. Then Use option button when you click on restore in iTunes and it should load that .ipsw image, so THAT operating system. Again, if you get stuck in recovery mode, use ReiBoot. It saved me countless hours of retrying and restarting my iPhone.