iPhone 2G with 3.0 update - success!

Yes, I have successfully updated my iPhone from 2.2 firmware to 3.0. It's quite a simple thing to do... All a big thank you to the awesome iPhone DevTeam! This is what I did on my Intel i7 with Windows Vista:

1. Back-up your SMS, Contacts, etc. using iTunes 8.2.
2. Click on your iPhone in iTunes, Shift + click on Restore and restore it with the ipsw 3.0.
3. Once that is done, get RedSn0w (Ask Google) and execute the program.
4. Just follow a bunch of simple steps, where you need Bootloader 3.9 and 4.6 also.
5. And then, you're done!

See, told you it's quite simple. For those who are having trouble with their updates being stucked at 'Downloading jailbreak data' with the loading icon moving, I believe it is because you are still on the old firmware. To me, I solved this problem by upgrading to 3.0 using the iTunes restore first, and then perform the update.

Try it, and goodluck to you if you are attempting it :)