About This Firmware
iOS 12.3.1
(build 16F203) is an official Apple IPSW
for the iPhone 6s+,
released on 2019-05-24.
The download is 3.11 GB and 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
iPhone_5.5_12.3.1_16F203_Restore.ipsw
Checksums
SHA-256
68ad422f97a94da2fecfe4c0b0773cfeab3c3515375c08f23a3f98bf64104345
SHA-1
a168b1bc901fb64cf725ab0dcca183dd684770dc
MD5
84a83ab5e05e2560fd6b08d6c014cd82
Direct URL
https://updates.cdn-apple.com/2019SpringFCS/fullrestores/041-68573/CC468F46-7C96-11E9-80BA-4EF06256CCDB/iPhone_5.5_12.3.1_16F203_Restore.ipsw
Other Devices
iPhone 15 Plus
iPhone15,5
iPhone 16 Plus
iPhone17,4
iPhone 16
iPhone17,3
iPhone 7 (Global)
iPhone9,1
iPhone 15
iPhone15,4
iPhone 3G
iPhone1,2
How to Restore with This IPSW
iTunes / Finder
macOS & Windows- Download the .ipsw file to your computer.
- Connect your iPhone 6s+ 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 iPhone 6s+ 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