Unlock Bootloader on Android 5.1.1 A5CN701?

I've been trying to unlock the bootloader since the A5CN701 update. Here's how i've tried:
1. Go to developer options -> Tick OEM Unlocking
2. Use the launcher.bat from IntelAndroid-FBRL-05-16-2015.7z from this topic http://forum.xda-developers.com/noki...howto-t3118965
3. Use the T4 option and the tablet ends up like this (because the bootloader is locked):



4. Use fastboot and enter this code:

Code:

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fastboot oem unlock

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Then the cmd console and the tablet should look like this:



5. Select ''Yes: change device state'' using the UI on the N1 but here's all i've received:





The result is :''Fail: couldn't change state''

So that's pretty much about how i've tried to unlock the bootloader. I don't know why i couldn't change the device state! Is there anyone that can help me?
I posted this topic so that everyone can join and make suggestions & solutions to rooting the A5CN701 firmware!
Any help would be much appreciated! :)
P/s: sorry for the sloppy photos, i didn't have time to crop and edit them :)