Quote:
Originally Posted by jsears
Figured it out for a Mac:
1.Connect the phone to iTunes.
2. Hold down the Option button and press "Check for Update."
3. Browse to the ISPW file that you want to upload.
4. Wait for the upgrade magic to happen!
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Yes, it's similar for Windows. One would hold down Shift while clicking "Check for Update", then browse to the IPSW file, etc.