Extracted firmware to 'iPhone 4, 5.1 (9B176)'. The output should look like this: Extracting content from iPhone3,1_5.1_9B176_Restore.ipsw, it may take a minute. Run the ipsw_decrypt.py script on the firmware you downloaded or backed up.
Disconnect your iPhone from your computer. Confirm that the backup was successful by selecting "Preferences" from the main iTunes menu, clicking the "Devices" tab, and then making sure that the time and date next to your iPhone's entry correspond to when you finished the backup. :max_bytes(150000):strip_icc()/DMGfilemoved-7a975a2261714767943ee4819b711541.jpg "decrypt dmg files windows")
Select "This Computer" in the Backups section, and then click "Back Up Now." ITunes backs up your entire iPhone, including iOS, to the hard drive. Click the button for your device near the upper-right corner of the iTunes screen, and then click the "Summary" tab if it isn't already selected. Start iTunes on your computer, and then connect your iPhone to your computer using its sync cable. For beta versions, check the VFDecrypt Keys page instead. 
Download an iPhone or iPad firmware that matches your simulator version and make sure that there is a VFDecrypt Key by checking the corresponding Build column. Make sure to install the vfdecrypt binary somewhere in your PATH or use the -d option of the the ipsw_decrypt.py script. VFDecrypt (required by ipsw_decrypt.py). Python 3.2 (required by ipsw_decrypt.py). You can extract even more artwork if you decrypt and mount an iOS firmware (.ipsw file).
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