How to downgrade firmware on iphone 3gs?
I have iPhone 3gs, I accidentally updated it to ios7 (from ios4.1) and now my sim card won't work. How to restore it to ios4.1? How to downgrade firmware?
It couldn't be a 3GS because it's not even supported with ios 7.
Sorry but apple have never supported software downgrading, why is it that your sim won't work?
If it's locked you could take it to your local carrier and get it unlocked (if you're on gsm)
The 3GS can't run iOS 7. The latest being 6.1.3.
Can't downgrade.
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