Galaxy S2 rooted and now problems - help! - Android Software/Hacking General [Developers Only]

Hello all,
If any of you pros can help me out with this I'll be eternally grateful.
So, I rooted my galaxy S2 with the guide on here and after superoneclick it just switched off. I booted it up and it just loops forever, yellow triangle then my provider (LGU+ Korea).
I can reboot into download mode and re-flash with XWKDD_insecure.tar. This starts the phone and I can access main features but it says rooted and I can't make any calls or 3g access.
As soon as countdown is up and screen locks (or I press lock) then the phone is bricked again and I have to re-flash just to get to that screen. So, I re-flashed and then ran the superoneclick program. Clicking unroot this time. It seemed to work and now I can get WIFI but no calls.
However, as soon as the screen is locked it is due a flash. Also, it's impossible to charge.
I'm new to this as you can tell but the guide is simple and I followed it step-by-step. I've read elsewhere on here that I can unroot this with a custom ROM? Where can I find these on the site?
Also, will they be applicable for me in Korea?
Basically I need to undo what I've done and get the phone reactivated. Please can somebody give me some advice and the download location of these ROMS that so I can get the phone reactivated.
Thanks in advance. Really stressing out here. It's on a rather expensive 2-year contract!

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Waiting for replies asap!
I'm new to XDA so please forgive me any slips. I didn't find a section for this exact device and I hope here is the right place to put this thread.

[Q] Bricked phone, need help unbricking. (System software not authorized....etc.)

So, I've done this before, and I've never bricked a device until now.
I tried installing a custom rom for my Galaxy S3 on Verizon, but when I restarted, it says this:
System software not authorized by Verizon Wireless has been found on your phone. Please turn off your phone and go to the nearest Verizon Wireless store for help.
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http://forum.xda-developers.com/showthread.php?t=1974114
Odin back to stock and next time after rooting make sure to use EZUnlock 1.2 to unlock the bootloader BEFORE loading a ROM

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Ok here we go thank you to whoever takes the time to answer these sorry if I sound uneducated in this field but I have no idea what I am doing really.
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3) What would happen if I flashed Cyanogenmod onto my device and it wasn't unlocked? I bought ROM Toolbox pro
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You'll get more help if you post in the correct Q&A forum
http://forum.xda-developers.com/galaxy-s7/help

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