Can't unlock again to flash new recovery or rom

So,
I wanted to install a new recovery because i want to try out multirom (http://ift.tt/2cCHOsC).
But when i wanted to flash the recovery I found out that the bootloader is again locked.
I tried to unlock if again but the fist problem was, that it said "error: device offline" every time i did "adb reboot bootloader".
So i just bootet into fastboot myself and did "fastboot oem unlock". Then the program said that it finished and my phone launched TWRP.
I heard that you need to press "Yes" in your recovery but nothing showed up. The phone is still locked and i can`t figure out what to do/ what i do wrong.
I hope you guys can help me,

Andy

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