About This Firmware
iPadOS 11.2.1
(build 15C153) is an official Apple IPSW
for the iPad Air 2 (Cellular),
released on 2017-12-13.
The file is served directly from Apple's CDN.
This firmware is no longer signed by Apple. Standard downgrades are not possible, but the file remains available for reference and advanced use.
Verify the download using the checksums below.
Filename
iPad_64bit_TouchID_11.2.1_15C153_Restore.ipsw
Checksums
SHA-256
d22407b8ca84c30bc8ae54c6e00e3b85991bdb8ed96a3cc968081f9feeb6dc99
SHA-1
5a673cb851a7c6b94c3a16cde0f780bbfed5f11f
MD5
2f5a8e21aa41456111aea8555536482e
Direct URL
http://appldnld.apple.com/ios11.2.1/091-55048-20171213-5FB7E860-DDFB-11E7-A289-10E4FB2783B2/iPad_64bit_TouchID_11.2.1_15C153_Restore.ipsw
Other Devices
iPad Pro 3 (12.9-inch, WiFi, 1TB Model)
iPad8,6
iPad Pro 2 (12.9-inch, Cellular)
iPad7,2
iPad mini (A17 Pro, WiFi)
iPad16,1
iPad mini 3 (Cellular)
iPad4,8
iPad Pro 4 (11-inch, Cellular)
iPad8,10
iPad 2 (GSM)
iPad2,2
How to Restore with This IPSW
iTunes / Finder
macOS & Windows- Download the .ipsw file to your computer.
- Connect your iPad Air 2 (Cellular) via USB.
- Open iTunes (Windows / macOS Mojave and earlier) or Finder (macOS Catalina+) and select your device.
- Update (keep data): hold Option (Mac) or Shift (Windows) and click Update, then pick the .ipsw file.
- Restore (erase & install): hold Option / Shift and click Restore iPhone…, then pick the .ipsw file.
- Wait for the process to finish - do not disconnect.
Restoring will erase all data on the device. Back up first.
3uTools
Windows- Download and install 3uTools from 3u.com.
- Connect your iPad Air 2 (Cellular) via USB and trust the computer on the device.
- Go to Flash & JB > Easy Flash.
- Click Import and select the downloaded .ipsw file.
- Choose Flash mode: Update keeps data, Restore wipes the device.
- Click Flash and wait for the progress bar to complete - do not disconnect.
Only flash firmware that matches your exact device model.
DFU Mode
Recovery tipIf your device is stuck in a boot loop or iTunes/Finder does not recognise it, enter DFU mode first, then select the .ipsw file as normal.
iPhone 8 / X and later
- Quickly press & release Volume Up
- Quickly press & release Volume Down
- Hold Side button until screen goes black
- Hold Side + Volume Down for 5 s
- Release Side, hold Volume Down 5 more s
- Black screen = DFU active
iPhone 7 / 7 Plus
- Hold Sleep/Wake + Volume Down for 8 s
- Release Sleep/Wake, keep holding Volume Down for 5 s
- Black screen = DFU active
iPhone 6s and earlier
- Hold Sleep/Wake + Home for 8 s
- Release Sleep/Wake, keep holding Home for 5 s
- Black screen = DFU active