How to Check iPhone 3GS New Bootrom / Old Bootrom (iBoot) Version

step 1: Put your iPhone into DFU Mode (not recovery mode)

• Connect your iPhone to your computer.
• Turn iPhone off.
• Start iTunes.
• Hold Power and Home buttons together for 10 seconds or so.
• Release Power button but keep holding the Home button until your computer recognizes a new USB device.
• iTunes will now recognize your iPhone.

Note: Your iPhone screen at this time should be blank (black in color), if not, then you are most likely in Recovery Mode, not DFU mode.

Step 2: Right Click on My Computer and click on: Properties -> Hardware (tab) -> Device Manager

Step 3: Select the “+” to open submenus tree items for "Universal Serial Bus (USB) Controller".

Step 4: Now look for "Apple Mobile Device USB Driver", right click and select Properties.

Step 5: Go to "Details" and find "Device Instance ID".

Step 6: Simply scroll through the string and you’ll find the bootrom version (iBoot) as shown in the screenshots below:

iPhone 3GS – Old Bootrom 359.3

iPhone 3GS – New Bootrom 359.3.2

Step 7: If it’s 359.3, you have old bootrom. If it’s 359.3.2 or anything above that, its a new bootrom.

Posted in: