Here’s a guide on how to downgrade iOS
11 to iOS 10.3.3 on iPhone/iPad.
Have you downloaded iOS
and want to downgrade back to iOS 10.3.3 on
your iPhone/iPad? Downgrading from iOS 11 to iOS 10.3.3 is
iOS 11 has so many new features
like New control center, redesigned App Drawyer for iMessage, iCloud
Syncing, Apple Pay, Screen Recorder, Wifi Sharing, Document Scanning, QR
reading, new redesigned Siri with improved voice and translation feature, New
Camera features & more features.

Want to downgrade iOS 11 back to iOS 10.3.2/10.3.3/10.3.1 on iPhone. Here's a guide on how to downgrade iOS 11 to iOS 10.3.2-10.3.1-10.3.3 on iPhone/iPad.

You might be feeling annoying bugs of
the latest iOS 11 version. Likewise, you have a battery drain issue and
crashing applications. Since iOS 11 is just released, it might have bugs and needs some more
improvements and bug fixes to run smoothly.
If you feel iOS 10.3.3 is better than iOS 11 or if
you have also faced a number of issues on iOS 11 and want to downgrade
your iPhone to iOS 10.3.3 from iOS 11 , here is how you can
get back to iOS 10.3.3 quickly.
No worries! if you
had accidentally upgraded iOS 11 through OTA update, you can easily downgrade iOS 11 to iOS 10.3.3 on your iPhone and iPad.
Since Apple is still signing the iOS 10.3.3 firmware,
downgrading is now possible. 

How to Downgrade iPhone from iOS 11 to iOS 10.3.3 
First of all, you need to download the
iOS 10.3.3 firmware file for your device from our Download page.
Step 1# You need to upgrade or
download iTunes to the latest version on your Mac or PC.
Step 2# Now Turn off Find my
iPhone & disable passcode lock via the Settings app. (Settings
> iCloud > Find my iPhone).
Step 3# Launch iTunes &
connect your iPhone, iPad & iPod Touch using data cable to your computer.
Step 4# Hold
the Alt/Option key on the Mac or Shift Key in Windows
on your keyboard. 
Step 5# Now Select the iOS
10.3.3 ipsw file you had downloaded earlier
Step 6# Then click on the Restore
Step 7# iTunes will inform that it
will restore your iOS device to iOS 10.3.3 and Click Restore
After restored, your device will reboot
to the welcome screen and will now install iOS 10.3.3 on your device.
That’s it. Your device should now be
successfully downgraded to iOS 10.3.3 from iOS 11. Your
downgrading process is completed; you need to now set up your device by
following the on-screen instructions.
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