Updated iPhone 4 to 5.0.1, now invalid SIM

sharingan_sasuk · 12 Jan 2012 at 18:58

Hi all, I have what I believe is an issue a lot of people are having. I have an iPhone 4 which I updated from 4.3.3 to 5.0.1 and it was working perfectly fine. But now it fails to activate the iPhone over the air or via iTunes even when using the same SIM card. Apple refuse to do anything because it's out of warranty.

I understand their point and they say they are getting tougher now regarding their warranty policies. But their update has caused me this issue and had I known it would have been like this, I wouldn't have updated it in the first place!

Apple have recently made available a small upgrade 5.0.1_9A406 which I have installed on the iPhone via iTunes after going into DFU mode which is supposed to fix this invalid SIM issue but it makes no difference!

If anyone has any idea if this could be fixed because it's out of warranty so I have nothing to lose, then I would be much appreciated. Regards.

VaderDSL · 12 Jan 2012 at 19:03

I think that upgrade refers to the 4S at the moment, which may be why it didn't work for yourself.

You could always try and downgrade to ios4 again till they come up with a solution?

Skyboat · 12 Jan 2012 at 21:31

VaderDSL said:
You could always try and downgrade to ios4 again till they come up with a solution?

He can only do that if the SHSH blobs have been saved for previous versions of iOS.

OP: Have you ever jailbroken your phone?

sharingan_sasuk · 12 Jan 2012 at 21:38

I've left the iPhone at work, and the 4.3.5 firmware downloading overnight. I'll give it a try tomorrow.

And yep, I've jailbroken iPhones many times before, although only with 4.3.3 as the last version I tried. How would that help me get past the activation part?

Skyboat · 12 Jan 2012 at 21:42

It won't help with the activation, but it's needed to downgrade iOS. Every time you jailbreak, Cydia uploads your phone's SHSH blobs to its own server so iTunes won't throw an error when you come to restoring an older firmware version.

EDIT: You might be better off downloading the 4.3.3 firmware instead.

Steve_bullockuk · 13 Jan 2012 at 07:43

sharingan_sasuk said:
I've left the iPhone at work, and the 4.3.5 firmware downloading overnight. I'll give it a try tomorrow.

And yep, I've jailbroken iPhones many times before, although only with 4.3.3 as the last version I tried. How would that help me get past the activation part?

You need to add sauriks server to your hostfile which tricks iTunes into activating the phone on 4.3.3 (aslong as your shshblobs are saved). There's plenty of guides out there.