These are instructions on how to determine the bootrom version of your iPhone using Mac OS X.

Step One
Connect your iPhone to the computer and put it into DFU mode. If you don’t know how to do this you can find instructions

Step Two
Click to select
About This Mac from the Apple menu at the top left of your screen.

Step Three
Click the
More Info… button from the About This Mac window.

Step Four
Click to select
USB from the list of Hardware Contents on the left side of the screen.

Step Five
Click to select
Apple Mobile Device (DFU Mode) from the USB Device Tree.

Step Six
Use the details pane, locate the Serial Number field and at the end you will see your bootrom version. It will look something like [iBoot-359.3]

***If you have an iPhone 3GS, iBoot-359.3 is considered the old bootrom. iBoot-359.3.2 is considered the new bootrom.

Related posts:

  1. How to Check the Bootrom Version of Your iPhone (Windows)
  2. Manually Jailbreak iPhone 3GS(New Bootrom) on iOS 4 Using Sn0wbreeze[Mac]
  3. HOW TO: Manually Jailbreak iPhone 3Gs With New Bootrom Running iOS 4 With Sn0wBreeze [Windows]

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