The iPhone 3GS with the new Bootrom cannot be jailbroken on iOS 4.How to Find Bootrom Version of iPhone 3GS So if you want to find the Bootrom version of your iPhone 3GS, then here is how to do it. Just follow the step by step guide given below to find Bootrom version of iPhone 3GS.

1. Connect your to your computer.

2. Now you have to enter into DFU mode.

Windows

3. Now right-click on ” My Computer ” and select ” Properties “.

4. In XP, select the ” Hardware ” tab and then select ” Device Manager “. In other two, straight away choose ” Device Manager ” on the sidebar after selecting Properties.

5. Under the ” Universal Serial Bus Controller “, you could find ” Apple Mobile Device USB Driver “. Right – click on it and select ” Properties “.

6. Choose the ” Details ” tab and select ” Device Instance Path ” in the list.

7. Now scroll sidewards and you could find the iPhone 3GS Bootrom version.

Old Bootrom is indicated by 359.3 and the other is the new one.

Mac OS X

1. Open ” System Profiler “.

2. Go to ” Hardware ” and then ” USB “.

3. Now under ” USB Device Tree “, choose ” Apple Mobile Device “.

4. There, in ” Serial Number ” section, you could find the iPhone 3GS Bootrom version.

Old Bootrom is indicated by 359.3 and the other is the new one.