Tamper/Unlock bit of Oneplus 2

Hello guys, I unlocked and then locked the bootloader after an attempt to bring back the 1+2 to stock.
I have used TOOL ALL IN ONE by MAURONOFRIO to do all this stuff.

Now I want to unlock the bootloader to try the CM13 , but when I write

fastboot oem device-info

It tells me that

Device tampered: false
Device unlocked: false

It seems like I can't unlock the bootloader, no matter how I try. Also I do not have the root so I can't follow this other guide.

Do you have any tip to help me out?

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