Hi, I have an iPhone 4 with IOS 4.0 (8A293) on it, and I would like to update it to IOS 6.1.3, (or any IOS 6). The problem is : iTunes won't accept to update using IOS 6.1.3 IPSW files saying : "the device isn't eligible for the requested build". I have a windows VM so I can use apps like iFaith and stuff... I made a signed IOS 6.1.3 IPSW file using iFaith but when I tried to restore or update the iPhone using that file iTunes wouldn't do it saying that the firmware file isn't compatible... :/ There must be a way to do what I'm trying to do but I'm a NOOB in jailbreaking and stuff... Please help me Thanks a lot.