Download iOS 4.2.1 GM (8C148) IPSW

iOS 4.2.1 GM is available as an IPSW file for 7 models. Find your device below to download it directly from Apple, copy the download link or verify the file with its SHA1 checksum.
  • Build 8C148
  • Type Release candidate
  • Released
  • Status Signed for some models
Security content

iPhone

3 files
DeviceIdentifierSizeStatus
iPhone 4 (GSM)iPhone 4 (GSM) iPhone3,1 655 MB Unsigned IPSW
iPhone 3GSiPhone 3GS iPhone2,1 421 MB Unsigned IPSW
iPhone 3GiPhone 3G iPhone1,2 339 MB Signed IPSW

iPad

1 file
DeviceIdentifierSizeStatus
iPadiPad iPad1,1 578 MB Unsigned IPSW

iPod touch

3 files
DeviceIdentifierSizeStatus
iPod touch (4th generation)iPod touch (4th generation) iPod4,1 638 MB Unsigned IPSW
iPod touch (3rd generation)iPod touch (3rd generation) iPod3,1 408 MB Unsigned IPSW
iPod touch (2nd generation)iPod touch (2nd generation) iPod2,1 364 MB Signed IPSW

No device matches these filters.

How to install iOS 4.2.1 GM with an IPSW file

Download the file that matches your exact model, then connect your device to a computer. Open Finder on macOS or iTunes on Windows, hold Option (Mac) or Shift (Windows) while you click Restore, and select the IPSW file. Follow our restore guide for every step.

iOS 4.2.1 GM is prerelease software. Back up your device before installing it, and keep in mind that a backup made on a beta cannot be restored to an older public release.

Only files marked as Signed can be installed today. See every other build on the iOS IPSW page.

Data from AppleDB, last updated .