About This Firmware
iOS 4.0.2
(build 8A400) is an official Apple IPSW
for the iPhone 3G.
The download is 305.38 MB 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
iPhone1,2_4.0.2_8A400_Restore.ipsw
Checksums
SHA-256
0b674e23dbd24d796eda26c9c57567f45431f3f85ca354d3d338add8a1bc4bd4
SHA-1
ee2bc74719170a7a2440b593b6f300727c930c69
MD5
6f3aefe1f8f516ae6e91fe993749347a
Direct URL
https://secure-appldnld.apple.com/iPhone4/061-8802.20100811.XcfpR/iPhone1,2_4.0.2_8A400_Restore.ipsw
Other Devices
iPhone 17 Pro Max
iPhone18,2
iPhone 12 Pro Max
iPhone13,4
iPhone 6+
iPhone7,1
iPhone 6
iPhone7,2
iPhone 6s+
iPhone8,2
iPhone 13 Pro
iPhone14,2
How to Restore with This IPSW
iTunes / Finder
macOS & Windows- Download the .ipsw file to your computer.
- Connect your iPhone 3G 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 3G 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