A clever MacRumors reader went digging around Apple’s XML files and has revealed the url to the iPhone 2.0 Firmware that is presently available on Apple’s servers.
The Apple Website Posts the following: Normally if you choose to update, the iPhone or iPod touch software is updated but your settings and media are not affected. If your device currently has a software version prior to 2.0 (1.x) and you are updating to software version 2.0 or later, all data on your device will be erased in order to perform install the new software. In this case, iTunes will offer to create a one-time media backup of your device depending on what content is on your device and what content is stored in the iTunes Library you are connected to. You should ensure that you have enough free space on your Mac or PC to accommodate a backup that matches the capacity of your iPhone or iPod touch (4 GB, 8 GB, 16 GB, or 32 GB) if you proceed with the this backup.
BE SURE TO COMPLETELY SYNC ALL DATA FROM YOUR DEVICE BEFORE UPGRADING FIRMWARE.
By the way, apparently this doesn’t work with the iPod Touch.
