Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

skeen

macrumors 6502
Original poster
Jul 12, 2007
264
0
London, England
Hey all,

Quite frustrated here. I updated to the new 3.0.1, and at some point an error popped up saying "Unknown error 21". Fair enough I thought, restart my iPhone and update some other time.

Now it just goes into DFU mode, and itunes tells me I have to restore it. But when I do that, guess what error I get? "Unknown error 21".

What a huge mistake updating was! Now I have no working phone!

Any idea what I can do to resolve this? Thanks.
 
Try pushing and holding the top button and home button to reset the phone it will reboot and tell you to restore... Try again. I updated with no problem...
 
Try pushing and holding the top button and home button to reset the phone it will reboot and tell you to restore... Try again. I updated with no problem...

That doesn't work. No matter what I do I get the error. So far I have tried switching to a different USB port, removing the software update files (re-downloading the update), and I am now trying to restore it on a different computer.
 
I"m having the same problem.

Was your phone jailbreaked?

I'm going to the Apple Store tomorrow to have them check it.
 
phone stopped working after attempted to install 3.0.1

I tried installing 3.0.1 today and my iphone gave me error 1604. Then it told me to restore. I attempted to restore, but that failed with error 3004. I tried rebooting, I tried checking for a more recent version of itunes, I tried powering off iphone, I tried resetting by holding both buttons until the apple appeared. I tried using another usb port. My iphone is stuck in a mode where it has a picture of the usb cable pointing to itunes. Help!
 
I tried installing 3.0.1 today and my iphone gave me error 1604. Then it told me to restore. I attempted to restore, but that failed with error 3004. I tried rebooting, I tried checking for a more recent version of itunes, I tried powering off iphone, I tried resetting by holding both buttons until the apple appeared. I tried using another usb port. My iphone is stuck in a mode where it has a picture of the usb cable pointing to itunes. Help!

That's restore mode. You need to get into DFU mode.

Follow this clip. Note: wait about 3 seconds after the screen shuts off before you release the power button.

http://www.youtube.com/watch?v=ofpinyGlQ8I
 
Simple people take it to the Apple Store and get it replaced or have them fix it.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.