It is known to all that the risk of iOS downgrade is much higher than iOS update. Thus, to ensure the safety of your iDevice as well as the files, you ought to know something important before starting the downgrade.

1. Be Patient While Downgrading

The iOS downgrade is a little bit complex and time-consuming, so please be patient while performing the downgrade. You should not interrupt the downgrading process or your phone data or system settings might be damaged.

2. The Usable iOS Versions are Limited

To accomplish the downgrade, you should first go to to download the wanted iOS version. But on this website, the still signed IPSW file is only on iOS 11.1, iOS 11.1.1, iOS 11.1.2 and iOS 11.2. That means you can only downgrade your iPhone/iPad from iOS 12 to iOS 11.1/11.1.1/11.1.2/11.2. Other earlier iOS versions are not signed now.

3. Cannot Restore the Backup after the Downgrade

After you uninstall iOS 12, you will be unable to restore your device with the backup that you created before the downgrade. If you want to get back the files, you should turn to some tools like iOS Data Recovery.

4. The Downgrade is Risky

Normally, the downgrade should be harmless but it also has the potential to brick your iOS device. Hence, in order to prevent the files on your device from losing, backing up the data beforehand is suggested.