In iTunes right click on your phone in the sidebar - Restore from backup - and then pick any one of the older backups other than the one you performed in iOS7.
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Downgraded from iOS 7 > 6.1.4 - "SIM Not Valid"
- Thread starter DrDesmo
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well, it only makes sense to keep a backup of what you had before, considering you were switching to an unreleased, buggy, beta OS. Sorry this happened, but you should have been more cautious.
Your computer should have some older backups, though.
Lol - the one I did the night of iOS 7 is gone. I specifically remember running a full back up in case I wanted to downgrade. I guess since once iOS7 was installed and I did a backup of that, it overrode the previous one with an entirely new iOS version. To me that makes no sense. 
My other back-ups are all 2+ months old. I don't change data much on my phone but it is all stored there.
My other back-ups are all 2+ months old. I don't change data much on my phone but it is all stored there.
Lol - the one I did the night of iOS 7 is gone. I specifically remember running a full back up in case I wanted to downgrade. I guess since once iOS7 was installed and I did a backup of that, it overrode the previous one with an entirely new iOS version. To me that makes no sense.
My other back-ups are all 2+ months old. I don't change data much on my phone but it is all stored there.
That sucks. I personally don't care too much about call history and old messages, but wouldn't want to lose photos. Although now would be a good time to transfer those photos to your computer. For those photos you want access on your iPhone, you can always sync those individually to your phone.
I do happen to like the automatic organization of photos in iOS 7, that has been sorely lacking.
there's no reason to manually download a firmware do go back to iOS 6, btw. put the phone in DFU mode and connect to iTunes and click restore.
Anyone had any luck? I'm having the same error after doing DFU restores whether I try iOS 7 or iOS 6.1.4. This is with my SIM (Fido), without a SIM in it (complains about no SIM), with a friend's SIM (Bell), and with another friend's SIM (also Fido). My phone is locked to Fido's network, and it's been working fine before. Now it's completely bricked.
I just got off the phone with apple and ATT for the past 6 hours. YES SIX. And it took going all the way up to a senior advisor to get my problem solved. Some of the phones you buy from the store are set up to work with all carriers and some aren't. My replacement iPhone was not "officially" switched to ATT and was by default to Canada Bell. Now since this was my first restore since getting the phone the restore defaulted back to "Canada Bell" making my phone a brick. Only the senior advisors have access to switching this. It cant be done in the store, a new iPhone will not fix the issue. And regular chat support will not be able to help. I was put on hold forever why they discussed the problem. Apple can do it in store but they send it in to the tech people and it can who knows how long.
So he went in a cleared all the CDMA and other networks from my activation name so it was just ATT GSM only.
Good luck.
So he went in a cleared all the CDMA and other networks from my activation name so it was just ATT GSM only.
Good luck.
Awesome! Do you happen to have the name of the Senior Service Adviser and case number you could PM me? I have one and they are trying to figure it out, maybe I could have them check your case for the solution as I'm in the same boat with "Sim Invalid". My phone too was a replacement phone from the Genius bar drawer and this was my first time restoring which ended up locking my phone to Verizon (was a Sprint phone).