The launch of the iPhone 3G has everyone excited, but what about those few who decided to stick with the original? Fear not, for v2.0 (OS) is now available for download from Apple.

However, as great as it may be that a few of the 3G’s goodies will now be incorporated into your first-gen iPhone, Apple has stated that should you install the v2.0 OS into your existing handset without backing up your data (for which you can use iTunes) you’ll lose all of it.

The update procedure is fairly simple. Connect the handset to the PC, open up your iTunes application, and simply click on the update button that appears in the iPhone menu in iTunes. Do remember to back up your data first. The final step is to just sit back and wait.

According to reports, a few users have had some issues with the update, but hopefully those will be rectified by Apple ASAP.

You can download the update file here.