How do I install iOS 4.3 GM on my iPhone 3GS?

Connect your device to your computer. Open iTunes (Windows / macOS Mojave and earlier) or Finder (macOS Catalina and later). Hold Option (Mac) or Shift (Windows) and click Check for Update or Restore. Select the downloaded IPSW file and follow the on-screen instructions.

What are SHSH blobs and how do I save them?

SHSH blobs are cryptographic tickets Apple uses to verify firmware installations. Saving them while a version is still signed lets you potentially restore to it later. Use TSS Saver (tsssaver.1conan.com) or the blobsaver app with your device ECID.

Home / iPhone / iPhone 3GS / iOS 4.3 GM (8F190)

iOS 4.3 GM

Build 8F190

No Longer Signed

iPhone 3GS iPhone2,1

Released

March 3, 2011

File Size

443.76 MB

Filename

iPhone2,1_4.3_8F190_Restore.ipsw

Download IPSW

Important Notice About Signing Status

Signing status was last updated less than a minute ago. Apple can stop signing at any time without notice.

Verify current status at IPSW.dev

Beta Firmware Notice

For official public releases, visit IPSWDL.com

Firmware Details

Device	iPhone 3GS (iPhone2,1)
OS Type	iOS
Version	4.3 GM
Build ID	8F190
Release Date	March 3, 2011
Signing Status	Unsigned Status last checked March 12, 2026. Verify at IPSW.dev
Filename	iPhone2,1_4.3_8F190_Restore.ipsw
File Size	443.76 MB
Download URL	https://secure-appldnld.apple.com/iPhone4/041-0328.20110311.Lkhy6/iPhone2,1_4.3_8F190_Restore.ipsw

Installation Instructions

How to install this firmware

Download the IPSW file.
Connect your device to your computer.
Open iTunes (Windows / macOS Mojave and earlier) or Finder (macOS Catalina and later).
Hold Option (⌥) on Mac or Shift on Windows and click Check for Update or Restore.
Select the downloaded IPSW file and follow on-screen instructions.

This version is not currently signed by Apple. Installation will fail unless you have saved SHSH blobs and are using futurerestore.

Other Versions for this Device

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