Hi, I have just got an iphone 3G singapore unit which is officially unlocked. It is already in firmware 2.2.1. Now I wish to jailbreak it. I have many jailbreak experience on Iphone 2g but this is my first time jailbreaking iphone 3G (SG unit). I've been reading the forum and a few other websites. I am now following the guide from iClarified. It seems I have to:

1. Download QuickPwn-225-2.zip
2. Download 2.2.1 (3G): iPhone1,2_2.2.1_5H11_Restore.ipsw (FOR THOSE WHO DO NOT WANT TO UNLOCK)
3. Put them into a folder named Pwnage on my desktop
4. Extract and start my pawnage from there.

Please let me know if what I am doing is correct. There are two ipsw file for 2.2.1 and I am downloading the one that does not need to unlock. I figure since i'm jailbreaking a SG iphone which is officially unlocked, that should be the ipsw file I use. Is that correct? Please kindly advise. Thank you.