How to Downgrade iOS 10

How to Downgrade iOS 10 - When trying to Downgrade iOS 10 from restore a backup, a message might say that your iCloud backup requires an iOS update, or your iTunes backup can't be restored because the software is too old. On Your Device, you'll asked to update your software in the setup assistant, follow the steps to update your software. If you aren't asked to update, you need to follow these steps and tutorial:

How to Downgrade iOS 10

In iTunes, or from the Apps & Data screen on your iPhone, tap Set Up as New instead of Restore from Backup. If you already tapped Restore from Backup, tap Back to return to the Set Up screen.

Follow the remaining steps. For now, you can skip the steps for Apple ID, Touch ID, and passcode.
Once the set up is complete, update your device to the latest version of iOS. Let the update finish, and wait for your device to restart.

Tutorial to Downgrade from iOS 10

Tap Settings > General > Reset > Erase All Content and Settings. After your device is erased, it restarts and you'll see the Hello screen in the Setup Assistant.

Now you should be able to set up your device again, and select older iOS versioon on a backup file to restore.
Another Tutorial Downgrade iOS 10 the current version :
If you're using iOS beta and want to go back to the current version of iOS, follow these steps:
Make sure that you're using the latest version of iTunes.
Put your device in recovery mode and restore it. If you turned on Find My iPhone, enter your Apple ID and password after the restore to activate your device.
If you can't finish the restore, get help.
After the restore is complete, you can set up your device from your archived backup. This backup should be from an earlier version of iOS.

If your device has a prerelease version of iOS and you restore the device to an earlier version of iOS, you might not be able to restore your backup. This can happen if the backup is from a later version of iOS. For example, if you restore your device to the current version of iOS and try to use a backup that you created using a prerelease version of iOS.
To remember the proccess while upgrading iOS 10 see the tutorial below :

Archive an iOS backup with iTunes
Before you install prerelease software, back up your device in iTunes, then archive the backup. You won’t be able to use an iCloud backup or one you didn’t archive if you go back to the current version of iOS.

Follow these steps to archive a backup iOS 10 :

1. Connect your device to your computer and open iTunes.
2. If you want to save Health and Activity data from your iOS device or Apple Watch, you'll need to encrypt your backup: Select the box called Encrypt [device] backup and make a memorable password.
3. Write down your password and store it somewhere safe, because there's no way to recover your iTunes backups without this password.
4. If you don't need to save your Health and Activity data, you can make a backup that isn't encrypted. Just click Back Up Now.
5. Wait for the backup to finish. Then go to iTunes > Preferences > Devices on your computer.
6. Control-click the backup you just made. Then choose Archive to save it. If you decide to go back to the current version of iOS, you'll need this archived backup.
7. Now you can install iOS 10 beta. Keep your iOS 10 beta up to date

If you get a notification that an update is available, tap Settings > General > Software Update to install the latest version of beta iOS.

Download the iOS 10 final version

If you have an iOS beta version and want to download iOS 10 final version, follow these steps:
Connect your device to iTunes.
While your device is connected, force it to restart. Press and hold the Sleep/Wake and Home buttons at the same time. Don't release when you see the Apple logo. Keep holding until you see the
Recovery Mode screen.
When asked, choose Update to download and install the latest nonbeta version of iOS.
An update install won't affect your content or settings.