Windows

1. Open PowerShell, and navigate to the IPSW file that you downloaded, e.g. cd Downloads
2. Type Get-FileHash iPhone7,2_8.4_12H143_Restore.ipsw -Algorithm SHA1
3. The output of the command should match the following checksum: 1b07a406e8d3c1fc6cd45fc7ed8fb721dcac31dd. If it doesn't, you may need to redownload the file.

macOS

1. Open a terminal, and navigate to the IPSW file that you downloaded, e.g. cd ~/Downloads
2. Type openssl sha1 iPhone7,2_8.4_12H143_Restore.ipsw
3. The output of the command should match the following checksum: 1b07a406e8d3c1fc6cd45fc7ed8fb721dcac31dd. If it doesn't, you may need to redownload the file.

Linux

1. Open a terminal, and navigate to the IPSW file that you downloaded, e.g. cd ~/Downloads
2. Type openssl sha1 iPhone7,2_8.4_12H143_Restore.ipsw
3. The output of the command should match the following checksum: 1b07a406e8d3c1fc6cd45fc7ed8fb721dcac31dd. If it doesn't, you may need to redownload the file.

---

Checksums

SHA256sum	41135036d4416ef301fb244476ab173cfa3627a3450e9a4f7d555c91f839601a
MD5sum	ce8cd9dde41652b9230cb467fc73855f
SHA1sum	1b07a406e8d3c1fc6cd45fc7ed8fb721dcac31dd

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

This update introduces Apple Music—a revolutionary music service, 24/7 global radio, and a way for fans to connect with their favorite artists—all included in the redesigned Music app. iOS 8.4 also includes improvements for iBooks and bug fixes.

Apple Music

• Become an Apple Music member to play from millions of songs in the Apple Music catalog, or keep them offline for playback later
• For You: Members can see playlist and album recommendations, handpicked by music experts
• New: Members can find the latest, greatest new music available—direct from our editors
• Radio: Tune in to music, interviews, and exclusive radio shows on Beats 1, play radio stations created by our editors or create your own from any artist or song
• Connect: See shared thoughts, photos, music, and videos from artists you follow, then join the conversation
• My Music: Play from all of your iTunes purchases, songs from Apple Music, and playlists in one place
• Completely redesigned music player that includes new features such as Recently Added, MiniPlayer, Up Next, and more
• iTunes Store: Still the best place to buy your favorite music—one song or album at a time
• Availability and features may vary by country

iBooks improvements and fixes

• Browse, listen and download audiobooks from inside iBooks
• Enjoy the all-new Now Playing feature, designed specifically for audiobooks
• Books that are Made for iBooks now work on iPhone in addition to iPad
• Find and pre-order books in a series right from your library
• Improves accessibility of widgets, glossary and navigation in books made with iBooks Author
• New default Chinese font
• New setting to turn off Auto-Night theme in your library
• Resolves an issue that may have prevented Hide Purchases from working
• Resolves an issue that may have prevented downloading books from iCloud

Other improvements and bug fixes

• Fixes an issue where receiving a specific series of Unicode characters causes device to reboot
• Fixes an issue that prevented GPS accessories from providing location data
• Fixes an issue where deleted Apple Watch apps could re-install

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

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