When you select the Reset Device to Factory Default command, it calls the iOS device’s Erase All Content and Settings function.
Based on testing, research and replication, it has been observed that a jailbroken iOS device is likely to fail when a call to Erase All Content and Settings is made whether remotely or locally. This is because the file system of a jailbroken device is slightly rearranged.
To resolve this issue:
- Confirm that the device has been jailbroken.
- Restore the device using iTunes from a desktop.
Note: Refer to your device manual for the procedures of this step.
- Reset the device to its factory default settings again either remotely from the administration console or locally from the device.