How to Downgrade iOS?

Downgrading is installing Apple previous iOS firmware version. There are several reasons for iOS downgrade.
With every OS release, Apple brings new features / device performance improvements and bug fixes. However, some users reported they have poor device performance ex-battery life / Wi-Fi after the upgrade. So this time, they searching downgrade possibilities
Sometime jailbreak tool developers are releasing jailbreak tool for older OS versions. So you can jailbreak with the downgrade.

Downgrade Compatibility

You cannot downgrade to any OS version. Currently, you can only downgrade iOS 9.3.2 to iOS 9.3.1 version.

How to downgrade preparation / guide

Before start downgrade process, you should complete necessary requirements such as
Download latest iTunes version
You must disable Touch ID feature and passcode- Settings > Touch ID & Passcode
Turn off find my iPhone Settings > iCloud > Find My iPhone
Download specific IPSW file according to your Device model.
Download latest iTunes version
Download latest iTunes
Plug device to PC
Open iTunes and go to Summary panel and click Connected iOS Device
Now click iTunes Restore option with following keys
Windows Left Shift Key
Mac Option + Alt
Now select previously installed IPSW file
Now iTunes will start Restore and once finished go through Settings and setup the Device.

Downgrade from iOS beta

If you are running on iOS beta version, you can restore the device to again back to current running version anytime
So just follow up below tutorial to downgrade iOS public beta to the current version of iOS
Make sure to download and run latest iTunes version.
Now put your device into recovery mode and restore
Once restore complete, setup your device to archived backup (you should choose this backup from earlier iOS version)

Downgrade after stop sign

After Apple stop firmware sign, you cannot downgrade with the support of iTunes as a normal. Therefore, you should save SHSH blobs for the future downgrade.
SHSH blobs

How to save SHSH blobs?

For the SHSH blobs save you should use compatible software. At this time, TinyUmbrealla / iFaith and Redsn0w are the common software
TinyUmbrealla compatibility up to iOS 8.1.2
iFaith compatibility up to iOS 6.1.3

Downgrade troubleshooting

iTunes incompatible firmware error make sure to download correct firmware version according to your device model.
iTunes Error 3194 if you receive this message continuously while on downgrade you cannot complete downgrade because Apple closed signing window.
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