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Turn off Airplane Mode before updating your iPhone firmware Posted on January 31st

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I finally updated my iPhone to 2.2.1 today, and after a reboot I got the screen that says it needs to verify or authenticate the SIM card. Unfortunately, that failed because, while I do have a SIM card in there, I do not have AT&T service -- and I had the cell radio turned off. My iPhone is never used as a phone (I don't have T-Mobile in my area, so even unlocking it would be useless). I wound up restoring the iPhone, which took a couple of hours, but apparently there's a better way.

Danny Goodman on the Apple Discussion boards posts this "2.2.1 Upgrade and SIM Error (and Solution)" tip. My advice? Always turn off Airplane Mode before applying a firmware update. The phone wants to access the radio hardware during the upgrade, it seems, and disabling the cell radio makes this impossible. Thus, I was locked out of my phone for several hours today. As luck would have it, I stumbled upon this tip about 5 minutes after I started the restore process.

Turn off Airplane Mode before updating your iPhone firmware originally appeared on The Unofficial Apple Weblog (TUAW) on Sat, 31 Jan 2009 12:30:00 EST. Please see our terms for use of feeds.

The Unofficial Apple Weblog (TUAW)Turn off Airplane Mode before updating your iPhone firmware originally appeared on The Unofficial Apple Weblog (TUAW) on Sat, 31 Jan 2009 12:30:00 EST. Please see our terms for use of feeds.

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