With the release of jailbreak tools like Ultrasn0w 0.93 and above 1.6 Sn0wbreeze, the team could also be working to your iPhone by any means. Below, we offer a guide that will help you perform the process.
How to verify iPhone 3G bootrom Windows 7/Vista/XP
Put your iPhone into DFU mode (not recovery mode)
Connect your iPhone to your PC.
Turn off your iPhone
Hold down the Power button together with the Home button for 10 seconds.
Release the pulsed power, and then continue to hold the Home button until your iDevice not recognized as a new USB perifertica.
iTunes recognize your iPhone.
Note: In this part of your iPhone screen will have had, if not then it is likely that you are in recovery mode.
Step 2: Right click “Computer” then click: Properties -> Hardware (tab) -> Device Manager
Step 3: Select the “+” to open up the submenu “Universal Serial Bus (USB) Controller”.
Step 4: Click the right mouse button on Properties for “Apple Mobile Device USB Driver”
Step 5: Then “Details” and “Device Instance ID”.
Step 6: Take a scroll to the entry page bootrom version (iBoot) and 359.3 means that if you have an old bootrom.