Cant unlock bootloader, adb vendoer key missing

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Oct 11, 2017
Hi i cant unlock bootloader of my zuk z2 plus, when i try some comands in minimal adb fast boot i get the following error
~ adb get-state
device unauthorized.
This adbd's $ADB_VENDOR_KEYS is not set; try 'adb kill-server' if that seems wrong.
Otherwise check for a confirmation dialog on your device.

adb kill and start server don't work, usb revoking dont work, re installing adb drivers didnt work, restarting and resetting phone didn't work.... what to do? please help.. No matter what i do i am not getting rsa key varification message in my zuk z2. is it because i updated to 7.0? :(
please help

I tried to creat the adbkey via keygen keyword, got the following.

C:\WINDOWS\system32>adb keygen .android/adbkey
generate_key: 8964: 5452 | generate_key '.android/adbkey'
generate_key: 8964: 5452 | Failed to open '.android/adbkey'