Too afraid to upgrade to 3.1.2

[dontwalkhand]

I am still running on stock 3.0 firmware for the iPhone 3G, that I ultrasn0wed with PwnageTool on my MacBook.

This is my main phone, and I do not have a backup to use should anything happen to my phone.

What do I need to do in order to upgrade it to the latest firmware, while still being able to use Ultrasn0wed unlocked iPhone?

 

[gngan]

I am still running on stock 3.0 firmware for the iPhone 3G, that I ultrasn0wed with PwnageTool on my MacBook.

This is my main phone, and I do not have a backup to use should anything happen to my phone.

What do I need to do in order to upgrade it to the latest firmware, while still being able to use Ultrasn0wed unlocked iPhone?

Too afraid? Don't update if you are scare.

If you actually READ this forum, dev's site/blog and Geohot's website then it should answer your question. This question is being discuss a lot in the first page of this forum. So don't be lazy and read it!