Hi Everyone, I recently bought an used iPhone 3gs from craigslist. It is Jailbroken to 3.1.3 with spirit I believe. (Update: I do not know what was used to jailbreak it). It says on the Cydia main page that "This device ahs SHSHs on file for iPhone OS: 3.1.3, 4.0, 4.0.1" So, do I need to back up the SHSH files on my Mac? If so, how do I do it? There are guides to do it BEFORE iPhone is Jailbroken, but I haven't been able to find any for iPhones AFTER they are Jailbroken. Also, there is a hardware problem with my iPhone and I still have warranty left. Can I restore it and take it back? Do I restore it the same way in this guide: http://forums.macrumors.com/showthread.php?t=603129 Update: Also, have you guys heard of jailbreakme? Would I need to worry about backing up my SHSh for that as well? Also, from the given information, can I safely infer my iPhone 3gs has the newer bootrom? Update: How do I figure out if spirit was used to jailbreak my phone. Thanks! PS: I think I have a newer bootrom, since it's jailbroken via Spirit. Also, if Apple replaces my iPhone, it might come with iOS 4. Would I be able to downgrade to 3.1.2 and spirit my way back to a Jailbreak?