I have a friends iPhone that needs to get unlocked. However, my friend does not know the original firmware version. She thinks it's either 1.1.1 or 1.1.2 but have later upgraded it to 1.1.3.

Is there a way to tell what the original firmware was? Does it matter, for unlocking purposed, if it was 1.1.1 or 1.1.2?

Thanks!