Apple iPhone 3G iOS 4.2.1 IPSW firmware
Apple iPhone 3G
Signed
iOS 4.2.1
Build 8C148 For iPhone1,2, n82ap
Global · IPSW
Download
323 MB
Downloads from secure-appldnld.apple.com.
File details
- Device
- Apple iPhone 3G
- OS
- iOS 4.2.1
- Region
- Global
- Type
- IPSW
- Released
- Size
- 323 MB
- File name
iPhone1,2_4.2.1_8C148_Restore.ipsw- MD5
8b1657935408a1638b69740b282f62b3- SHA-1
d2ed58586e8ca2153f2e2ec585bba8afc5173378- SHA-256
98e5969c3baed660c9a26e94cd7ed4b3cdb7175900f448bcc2223bf885835ce0
After downloading, compare the checksum with the one above. If they differ, the file is incomplete — download it again.
Before you download
- Make sure your device’s model number is one of: iPhone1,2, n82ap. You will find it in Settings → About phone, or on the box.
- This file is for the Global region. Installing another region’s firmware can remove features or block updates.
- Apple devices can only restore versions marked “Signed”.
- Back up your photos, contacts and files first, and charge the battery above 50%.
How to install
Use Finder on a Mac or the Apple Devices app / iTunes on Windows to install an IPSW file. Apple only accepts versions it is still signing, so check the “Signed” label before you download.
Read the guide: How to restore an iPhone, iPad or iPod with an IPSW file