OK I've figured this out and now I have the correct S-OFF bootloader installed and Im back up with my custom rom as good as before. Was a bit stressful though.
The link you gave had ALOT of conflicting info in it, as is often the case. Filtering through I was able to get it done. I'm going to post a quick guide here hoping to help anyone else who wants to do this too, since there is NO good guide out there that I could find.
Assumptions/Prereqs
1. You have already rooted your phone
2. You have already loaded any custom rom, doesnt matter which one
3. You have made a nandroid backup of your current phone setup
4. You are doing this b/c you want to have a unlocked or "S-Off" bootloader that will let you use fastboot among other things.
5. You must install the android SDK on your PC, google it.
6. You must install the USB drivers for your phone if you havnt already. Easy way to do this is download and install the PDAnet PC client from
Download PdaNet and install it. Part of its install sets up the USB drivers easily.
Step by Step (files needed can be found on other forums, start with the links at the bottom of this post if you are having any trouble finding them)
1. Download the Original Root Rom PB00IMG.zip and put it in the root of your SD Card.
2. Download Amon's Recovery recovery.img , and put it in your tools directory of the SDK
\tools\recovery.img
3. Copy your Nandroid backup off of your SD Card and put it in the tools directory of the SDK as well, you need 3 flies.
\tools\boot.img
\tools\system.img
\tools\data.img
4. Power off your phone and boot it while holding down Vol- and power. This will autoload the PB00IMG.zip file and it will take awhile, watch the blue progress bar in the upper right corner of the screen. It will eventually ask if you want to update, choose yes and let it do its thing. After it finishes it will ask you to reboot.
5. This is VERY important. Save yourself some trouble, I didnt do this and the resulting worry headache I got plagues me still. REMOVE your SD Card from the phone and using a card reader or whatever other method, delete that PB00IMG.zip file from the card. If you dont, this process will just repeat over and over since it loads it automatically in step #4.
6. Put your card back in and then reboot with Vol- and power. You will now see the S-Off at the top of the screen instead of the S-On that was there before. Plug your phone to the PC and select Fastboot on the phone.
7. From a command prompt in the tools directory of the SDK type this:
fastboot flash recovery recovery.img
It will do this:
sending 'recovery' (3834 KB)... OKAY
writing 'recovery'... OKAY
All Done now you just have to load your Nandroid image and you will be back to normal with a newly unlocked bootloader. At this point you could just load up another custom rom as you did when you rooted from the recovery screen, if you dont mind doing all your setup all over again.
Recovering your Nandroid:
I had an issue here where my phone WOULD NOT load the Nandroid image from the recovery menu. Dont know why, I wasnt expecting that, if someone knows why please let me know. I had to find an alternative method to reloading my Nandroid (this is why I had you put your Nandroid image in the tools directory before we started.)
*EDIT* I have since learned that my problem was most likely that my battery was below 30% at this point in the mod, and Amon's Recovery will not restore when it is that low. I have not tested it but I think that was the problem. So, the below instructions for recovering your nandroid still apply if for some reason Amon's Recovery will not load them, but as long as you are above 30% battery, you can do it the normal way from within the recovery program.
At this point if you havnt touched anything your phone is plugged to the USB and you are sitting at a command prompt having just loaded that recovery file. Now we load your Nandroid image through the command prompt as well.
1. Run these commands on the PC cmd prompt in the tools directory:
fastboot flash boot boot.img
fastboot flash system system.img
fastboot flash userdata data.img
Confirmations of it sending and writing the files will follow after each command when you run it.
2. Thats it, unplug your phone and do a NORMAL boot. You will be right where you left off before you were crazy enough to try to unlock your bootloader and change it to S-Off.
This seems like alot I know, but its really not that much. I put it all down in detail because I hate it when someone posting a guide is not clear and precise.
Tying this all back up with the 1 Click Root experience, it leaves me wondering if someone could put an unlocked bootloader within 1 Click and save people the trouble of all this mess. I'm not a Dev so I dont know if its even possible, but it sure would save people alot of work. Anyway, if you read this far, thanks for reading and I hope I helped someone other than myself. 1 Click is a great application/method and I wanted to give back a bit.
I have to give credit to the guys posting in the following forums for this. I picked and poked at what they said, and added in my own experiences.
How To Install Engineering bootloader FOR LEAK ROOTERS - xda-developers
http://androidforums.com/eris-all-things-root/75384-visual-example-pb00img-zip-update-method.html
How to Restore a Nandroid Backup - GetYourDroidOn