Is iOS 11.3.1 Still Signed?
Unsigned
An "Unsigned" status means that Apple's servers have stopped authorizing the installation of this firmware version. You can no longer restore or downgrade your device to this specific version. Attempting to do so will result in an error.
Firmware Details
- Version
- 11.3.1
- Build ID
- 15E302
- Release Date
- April 24, 2018
- Signing Status
- Unsigned
Compatible Devices
Currently Signed Devices (0)
Apple is no longer signing this firmware. As a result, it can no longer be authorized for installation or restore on any devices.
Looking for the download links?
See every compatible device for iOS 11.3.1 with file sizes, build IDs, and direct Apple download links.