Hot answers tagged iphone-4s
You cannot downgrade to anything less than 8.4.1 now. Apple signs iOS software, they currently only sign 8.4.1-9.0.1. This means that you can't downgrade to 7.1.2.
Only way you can do this is if you have already saved SHSH blobs from the time when iOS 7.1.2 was current. You can no longer get them, nor can you use someone else's (as they are unique to the device). So unless you already have these blobs you cannot downgrade More info Apple signs iOS software and whenever you upgrade or restore, iTunes will first ask ...
AT&T has a site to check and ask for device unlock: https://www.att.com/es-us/deviceunlock/#/
the iPhone 4S doesn't have the 5GHz band, only the 2.4GHz The first iPhone to support 5GHz was the iPhone 5. I can't find an official Apple link that clearly states it, but Everymac covers all Apple models comprehensively - http://www.everymac.com/systems/apple/iphone/specs/apple-iphone-4s-specs.html
Easily spoken, you could say ispw files are not complete. They're missing that so-called signature. It's like a contract; it has no value without the signature. Every time you install new firmware on the iPhone, iTunes calls to the Apple servers and ask for that approval signature. For numerous reasons, Apple doesn't give out those signatures for older ...
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