How to SIM Unlock an SGS3 with android 4.3 & root & code not working - Galaxy S III Q&A, Help & Troubleshooting

Hi,
I have an Samsung Galaxy S3 I9300, unfortunately it is carrier locked to Telenor, and I have accidentally updated it to android 4.3, where the EFS version has changed.
I have already rooted it with Odin and CF-Auto-Root, but can't find any damn way to unlock it (don't even mention the "pay for code" sites, i'd rather crush this phone in my hand than pay a cent for unlocking it, free way is the only one to go)
Do you have any ideas? If you need any more information then just ask, I will tell anything you need.

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Better crush it now and save yourself some time. Samsung changed the efs for a reason, that reason stops you unlocking it.

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boomboomer said:
Better crush it now and save yourself some time. Samsung changed the efs for a reason, that reason stops you unlocking it.
Click to expand...
Click to collapse
Hmm, I think I can make it, maybe not by unlocking it "illegally" but by asking the carrier (I know the person who has bought the phone locked, will ask him to call the carrier and ask for unlock code because he needs to go to another country where he cannot use his SIM card, these bastards need to respect their clients.
I still need to downgrade it to 4.1.2 tho, version 4.3 just sucks and i need to charge the phone 3 times a day if i want to use it normally, also everything is laggy and launching a few apps causes a crash to the menu very often.
I read that it is kinda troubled, because the bootloader changed and now wont allow to flash an older one, but I can flash stock 4.1.2 ROM which supports EFSv2 and that only the LTE version of SGS3 cannot be downgraded, is it right?
I attach a screen from Phone Info app, let me know if it is possible to safely downgrade to 4.1.2 and where should I head in order to do it.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

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I got the unlock code (NCK) from the carrier, but after trying it i got an "Network unlock unsuccessful" message...the phone is still locked and I have already tried unlocking it 2 times (first because I thought it was asking for SIM PIN lock, and now with that code which I'm 100% sure is correct but the phone is acting weird) and I'm kinda scared to try it again because it may get locked permanently (i think?) and I will need to pay for some defreeze code..
I searched a bit and found out that other people also had this problem, and they fixed it by doing this:
In order to successfully unlock the phone, this had to be done firstly:
1. Make sure that wifi and flight mode is turned off
2. Go to the Dial pad and dial *#197328640#
3. Click on number [1] UMTS > [1] Debug screen > [8] Phone Control > [6] NETWORK LOCK
4. You will see 3 options
5. Please click on number [1] Perso Sha256 INFO, the screen will change slightly
6. Please hit the MENU button then when the menu pops up please carefully hit BACK to return to the previous screen
7. Please click on number [2] Perso Sha256 ON, the screen will change again to a one line message
8. Restart the phone on the screen by holding the power button and click RESTART
9. Reattempt to enter the code
10. Now the phone is supposed to accept the unlock code.
Click to expand...
Click to collapse
but the problem is that after dialing that code, all I get is "Not registered on network" error. I'm running stock ROM updated to 4.3 (from phone) but the phone is rooted, may this be the cause?
I will try calling that carrier later but im 100% sure they will just tell me to try again, and im also 100% sure that the code I entered was correct.
I am doing it the "legal" way and it also doesn't work, so is this damn phone just unlockable, even the carrier who locked it cannot do anything?
Edit
If nothing will work with that code then I will maybe try doing this:
http://forum.xda-developers.com/showpost.php?p=50463614&postcount=7
however I'm not really positive about it, it will very likely fail. It's a complete bull**** that this phone cannot be unlocked even by the carrier who locked it...

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Guys i have no idea, i've flashed stock 4.3 ROM from Telenor to unroot it and factory formatted the phone (from android recovery) but still after entering the code it says unsuccessful...Any damn ideas about this? I managed to get into the Network Lock menu from *#0011# and Key Input->Q0 but it just says MENU NOT EXIST current command is 186. Not even the legal way to do it works, so I'm just supposed to throw this phone away?...