Apple iPhone 3GS iOS 5.1 IPSW firmware
Apple iPhone 3GS
Not signed
iOS 5.1
Build 9B176 For iPhone2,1, n88ap
Global · IPSW
A newer version is available for this region: iOS 6.1.6
Apple no longer signs this version, so a normal restore with Finder or iTunes will fail. Use a signed version unless you know you need this one.
Download
687 MB
Downloads from secure-appldnld.apple.com.
File details
- Device
- Apple iPhone 3GS
- OS
- iOS 5.1
- Region
- Global
- Type
- IPSW
- Released
- Size
- 687 MB
- File name
iPhone2,1_5.1_9B176_Restore.ipsw- MD5
51e253431b1080cbbb5073efc87b1bb3- SHA-1
4182c7ee075a5acbb2595b1cc27fe279e9c343ce
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: iPhone2,1, n88ap. 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