iOS 5.1 (9B176) for iPhone 4 (GSM)

✗ This firmware is not signed. This means you cannot restore to it in Finder, the Apple Devices app, iTunes, or idevicerestore.

Upload DateFebruary 29, 2012
FilenameiPhone3,1_5.1_9B176_Restore.ipsw
Filesize784 MiB
MD5sum706b8987b37bc99e349197ecc5e26c3b
SHA1sumed0ffe5ad5e63fe3a977a1ffe49bedbe2dcffd89
IdentifieriPhone3,1

iOS 5.1 Release Notes

Please note, the documentation below is supplied from Apple's update servers. We don't modify the contents of this documentation.

iOS 5.1

This update contains improvements and bug fixes, including:

  • Japanese language support for Siri (availability may be limited during initial rollout)

  • Photos can now be deleted from Photo Stream

  • Camera shortcut now always visible on Lock Screen for iPhone 4S, iPhone 4, iPhone 3GS and iPod touch (4th generation)

  • Camera face detection now highlights all detected faces

  • Redesigned Camera app for iPad

  • Genius Mixes and Genius playlists for iTunes Match subscribers

  • Audio for TV shows and movies on iPad optimized to sound louder and clearer

  • Podcast controls for playback speed and a 30 second rewind for iPad

  • Updated AT&T network indicator

  • Addresses bugs affecting battery life

  • Fixes an issue that occasionally caused audio to drop for outgoing calls

For information on the security content of this update, please visit this website:

http://support.apple.com/kb/HT1222

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