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Update iPhone software/firmware from any computer iOS devices
I have a friend who had their G5 die, and they are relying on their iPhone while waiting for their new iMac to ship. However, they have been having issues with the various bugs in the iPhone's 2.0.x software. So I decided to update their iPhone from my MacBook Pro. I couldn't find any documentation that said if it was possible, so I gave it a try.

When you first plug in the other iPhone, iTunes asks you to erase and sync the phone; hit Cancel at this point. Next, select the iPhone in the Devices column, and uncheck the 'Automatically sync when this iPhone is connected' and 'Sync only checked songs and videos' boxes in the Options section of the Summary tab. Now click the Update button to run the update.

The iphone will do its update thing, and no data will be lost.
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Update iPhone software/firmware from any computer
Authored by: cawaker on Sep 19, '08 11:32:56AM

This is also true for just updating the iphone on other OS X accounts.

I have 2 accounts on my machine, one for work, the other for home. I was able to update my phone with my work account even though my home account is the phones main sync account.



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Update iPhone software/firmware from any computer
Authored by: asmeurer on Sep 19, '08 03:33:03PM

I wish I knew this about three weeks ago when I had no computer and the 2.1 software came out.



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Update iPhone software/firmware from any computer
Authored by: robogobo on Sep 19, '08 04:52:51PM

Hmmm, is iTunes making a backup before the update. If not that's awful risky.



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Update iPhone software/firmware from any computer
Authored by: leebennett on Sep 19, '08 06:37:58PM

Variant idea which may be safer. Go into the Devices section of iTunes preferences instead and turn on the checkbox for "Disable Automatic Syncing..."



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