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Put your iPhone 3GS into Recovery mode - switch it off, hold down the Home button, and plug the USB cable in. When it shows a picture of the iTunes logo and a USB cable, stop holding down home.
Windows:
1) Download USBView
2) Start USBView on your PC.
3) In “options”, check off ”config descriptors” (enable).
4) Hit F5 on your keyboard to refresh.
5) Scroll down until you see ”Apple Recovery (iBoot) USB drive”, and click on it.
6) Look for ECID in right navigation pane.
7) Copy the 16 digits that follow the ECID.
Mac:
1) Open System Profiler.app (In Applications -> Utilities)
2) Click USB and select the iPhone from the list, it will show the ECID there.
To get out of recovery mode, simply hold down Home + Power until your phone reboots.
