while trying to unlock the phone, i started getting those codes and numbers on the phone screen so i tried to push On/Off button with Home to go to restore again but i am getting a yellow triangle to get connected to itunes. when i connect to itunes, the codes appear again. i just can't get to the DFU mode to restore the original again.
What can i do? Please assist. anyone faced this?
(serial number less than 45)

DFU is always possible, but can, depending on the situation of your iphone, take several tries. Only when it's dead, DFU is impossible.

Try, when the codes run on the screen, follow the steps to get into DFU. You can always try to use independence for getting into DFU.

To be clear:
Connect your iphone to your comp, if itunes opens, close it
2 hold "home" and "sleep" button together
3 after 10 seconds, release the "sleep" button while keeping the "home" button pushed
4 after 15 seconds, start up itunes while still pushing the "home" button
5 when itunes says that it has discovered an iphone in recovery mode, release the "home" button
6 restore

Remember that it could take several tries to get there and start the steps when the phone is on (in your case the codes on the screen).

I'm on a G5 Imac 10.5 and a MacBookPro also 10.5 began with a 1.0.2 phone and unlocked that fine with Anysim. I then foolishly went up to 1.1.1 through the iunlock.no method where all the scripting was taken care of via installing the files from his simple tutorial. After that it was OK til i went to install some new third party apps and then all hell broke loose. It started with my battery draining fairly quickly one day in normal operational mode and then could not recharge successfully. I then experienced a problem where the phone would trigger Itunes which would then ask to restore and it would attempt this and get the 1604 (and 1603) error....and then it went to black and nothing after about 15-20 attempts at the restore method. I haven't tried the Itunes de install method suggested in other posts/forums elsewhere. I have tried your hidden restore method here and still no luck. I am now unable to power the phone at all in any capacity. As I'm in Australia, I cannot take it anywhere as we officially do not have the phone here and my Mac store advised that their tech people will not look at it anyway as it has been unlocked. Please help

Roman