This article is a how to on downgrading your iPhone, iPod Touch or iPad to iOS 7.1.2 or iOS 8 from iOS 8.0.1.
iOS 8.0.1 was released by Apple to fix a few bugs in iOS 8, however it only created more. They have since pulled the update, but if you have already updated you may want to undo your decision to update and want to downgrade.
First you will need to make sure that the firmware you want to downgrade for is still being signed for your device. This page is a great way to see if it’s still being signed. Remarkably, at the time of writing, iOS 7.1.2 is still being signed and so you can still downgrade to that.
If you’ve checked that page and your firmware still is being signed, you’re OK to continue to the next step.
Next, download your IPSW file. This will be different for each model of device, and you can download the right one by going to our Downloads page. Make sure you download the right model or things could go wrong later.
After the IPSW has downloaded (it may take some time depending on your internet connection), open up iTunes and connect your device. Then hold the left ‘SHIFT’ (PC) or ‘Alt/Option’ (Mac) key and click on ‘restore’. Then select the file you downloaded earlier. If the file is 8.0.0 and not 7.1.2 you can use ‘update’ and still keep your data.
Note: If you have Find My iPhone enabled, it will prompt you to turn it off before restoring.
After this, the device will go through the process of restoring and then you should be good to go.
Let us know if you have any issues or questions in the comments below.