I can't unlock my phone using video tutorial. I thought it was this video that is the problem. I check on another video and they are all the same. The problem I have is the bootloader. I was having problem them same with everyone else here. When the Iphone reboots it didn't boot up. It was a problem with the bootloader. Now try this link for the bootloader and try again this video tutorial.
Because of this video below I have Unlock and jailbroke my Iphone 2G.
Download the following files first":
Redsn0w for PC (Windows): http://xs1.iphwn.org/redsn0w-win_0.9....
Redsn0w for Mac: http://xs1.iphwn.org/redsn0w-mac_0.9....
iPhone 2G 3.1.2 FW file: http://bit.ly/q9D1O
iPhone 3G 3.1.2 Firmware File: http://bit.ly/vIfJj
Bootloaders for iPhone 2G Unlock only: http://www.mediafire.com/?9mdezqi2jem