IOS 10 beta will released in June. We know that lots of iOS 9 owners will be want install iOS 10 beta on their iDevices. If you are one from such owners, you must know that you always can downgrade iOS 10 to iOS 9. Ok. How??
iOS 10 will come with over 100 new features that will make the iPhone, iPad, and iPod Touch even better, but there’s a few caveats: first, it doesn’t run on all hardware, and second, on some of the supported devices the feature set will be limited. We’ll sort all of that out.
>> don't forget read about iOS 10 release date + instructions <<<
How to downgrade iOS 10 to iOS 9*:
iOS 10 Supported devices:
iPhone: iPhone 6S/6, iPhone SE/5S/5C/5
iPad: iPad Pro, iPad Air 2/1, iPad 4, iPad Mini 4/3/2
iPod Touch: iPod Touch 6 Gen.
Step 1: Turn the device off, connect it to the computer via USB, and launch iTunes
Step 2: Place the iOS 10 device into DFU mode: with the device off, hold down the Power and Home buttons together for 10 seconds then release the power button, continue holding Home button until iTunes notifies you of a device in recovery mode being detected. The devices screen should stay black as if turned off.
Step 3: Restore within iTunes through either method a or b:
a) Restore from the last iOS 9 version backup you made prior to installing iOS 10 betaStep 4: Let iTunes restore back to last version of iOS 9, the device will reboot when finished
b) Restore to last version of iOS 9 IPSW by Option-Clicking the “Restore” button, and then restore from iCloud backup when finished
Typically you can’t downgrade iOS versions so easily, but because Apple is still signing iOS 9 this allows downgrading to commence with minimal effort.
Don't forget, here you can see all iOS 10 download links