This guide explains how to do the downgrade to iOS 8 for those who have made update to ios 8.0.1. This does not come out until an update to iOS 8.0.2 to fix the problem no Cellular Service And No Touch ID

iOS-801-fix

How To Backup Using iCloud / iTunes

Since we’re doing a clean restore (downgrade) to iOS 8, therefore you’ll lose everything on your device, hence making a full backup of your device should be your first port of call.

Navigate to Settings > iCloud > Backup and hit the Back Up Now button to backup everything to iCloud.

Alternatively, you can use iTunes to backup your device. Connect your device to your Windows PC / Mac and launch iTunes, then click on This Computer under the Backups pane. Then click on Back Up Now. This might take a while depending on how much content you have on your device.

 

Restore Using iTunes

Step 1: Download iOS 8 final IPSW from here. Download the correct IPSW file catered for your iPhone 6 or iPhone 6 Plus.

Step 2: Once the download is complete, connect your iPhone 6 / 6 Plus to your Windows PC or Mac via USB, and launch iTunes. But before proceeding forward, turn off Find my iPhone on your device by navigating to Settings > iCloud > Find my iPhone and turn it off.

Step 3: Select your iPhone from the left-hand side column in iTunes.

Step 4: While holding down the left Option key on your Mac (or left SHIFT key if you’re using Windows), click on the Restore iPhone button.
Step 5: Select the IPSW firmware file you downloaded in step one and let iTunes going through the restoration process.

When the restore process is complete, you’ll be back to iOS 8.0 sans the cellular and Touch ID issues.

 

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