How do I install iOS 4.2.1 GM on my iPad?

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 / iPad / iPad / iOS 4.2.1 GM (8C148)

iOS 4.2.1 GM

Build 8C148

No Longer Signed

iPad iPad1,1

Released

November 18, 2010

File Size

578.08 MB

Filename

iPad1,1_4.2.1_8C148_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	iPad (iPad1,1)
OS Type	iOS
Version	4.2.1 GM
Build ID	8C148
Release Date	November 18, 2010
Signing Status	Unsigned Status last checked March 11, 2026. Verify at IPSW.dev
Filename	iPad1,1_4.2.1_8C148_Restore.ipsw
File Size	578.08 MB
Download URL	https://secure-appldnld.apple.com/iPad/061-9857.20101122.VGthy/iPad1,1_4.2.1_8C148_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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