Tutorial : Which bootROM (boot loader) do i have on my 3GS?

[iphonewoman]

Lot of people asking this question, though i would help out.

Method 1

Put into DFU mode, robotic instructions here, lol.
On your computer... Start > Control Panel > System > Hardware > Device Manager
Find "Universal Serial Bus (USB) Controller", subitem Apple Mobile Device USB Driver.
Right click, choose Properties, go to Details, select
Device Instance Path from the dropdown box. The end of this info string will tell you the bootrom version, e.g. iBoot-359.3.2

iBoot-359.3.2 is the NEW BOOTROM
iBoot-359.3 is the OLD BOOTROM

Method 2

Install usbview link here
Put the iPhone 3GS in DFU Mode
Run the Application usbview
Check if you find:

iBoot-359.3.2 - then its the new bootrom
iBoot-359.3 - is the old one

source

 

[Applejuiced]

Good info.

 

[thelatinist]

We already have a thread with over 23,000 views on this issue with instructions for both Windows and Mac.