With this, lots of people will want to make sure they remain on whichever i OS 11 version they are currently running. Once you jailbreak your device, it becomes much more difficult to safely restore it to factory settings without updating.
This is due to modifications that are made by jailbreak apps/tweaks that won’t be undone simply by using ‘Erase all content and settings’ in the settings app. Prometheus (AKA futurerestore) is a tool created by tihmstar which allows you to restore to unsigned i OS versions as long as you have SHSH2 blobs saved for them.
If you are currently running i OS 10 jailbroken, and want to update to i OS 11 to jailbreak, you can follow the guide linked here.
This tool is quite complicated to use, but as long as you do everything correctly, you can restore an i OS device to an unsigned i OS version.
Need to restore i Phone but do not want to update to a newer version of i OS like i OS 11 or i OS 10?
This means deleting all your data and settings from it.
Now gradually the apps will reappear after which you can disconnect the i Phone.