There is a simple tool called “iDetector” provided by @iH8sn0w that allows you to check your 3GS bootrom version. With this information you can then find out if  your iPhone 3GS has the Old Bootrom (359.3) or New Bootrom (359.3.2).

You can download the program from the iH8sn0w.com website here. I’ve also mirrored the utility on our site as well to make sure its available even if MediaFire goes down.

Windows Download:  iDetector 1.0 (499)

Why would you need to know this in the first place? The current Jailbreak out for iOS4 on the 3GS only works on the Old Bootrom (359.3). If you don’t check, and you try the JailBreak on your phone, you could come into some problems. Always make sure that you have saved your SHSH Blobs for your iPhone.You should have iOS3 and iOS4, if not then you can always use Saurik’s server to be able to restore if they’re present on his server. You will know if this is true when you open Cydia and it says “This device has SHSHs on file for iPhone OS: 3.0, 3.1, 3.1.2″. As long as you have one of them you can restore back to 3.x.x, the following screenshot shows what it will look like in Cydia.

Otherwise if you don’t have your SHSH’s for iOS3, you will have to restore your iPhone to iOS4 without a Jailbreak, and will only be able to use userland Jailbreaks in the future from what I understand.

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