The tool for it is called futurerestore (codenamed Prometheus). The biggest caveat to this tool is that you must be jailbroken in most cases before initiating the restore (and you only have one shot, so a failed restore will force you to install a signed firmware) (if that signed firmware is also jailbreakable, then technically you get second chances, but it's rare for that to be the case unless there's a bootrom exploit for your device). Right now, the best tutorial for Prometheus is by and is endorsed by the author of Prometheus, I will be updating this answer later to explain more about it, but I wanted to get this information posted here sooner rather than later. Other Note: I am missing information about the original Odysseus which allows a few 32-bit iOS devices to downgrade in the iOS 6 and 7 range. Other Other Note: There is an even newer method of downgrading/upgrading that will allow almost all 32-bit devices (doesn't include the 32-bit devices that can install iOS 10) to go from iOS 9.3.5 firmware to any other iOS 9.X firmware. Other Other Other Note: There is an new bootrom exploit for A5 to A11 devices called checkm8.
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