Phone must be rooted. I have done this with 20A official ADEUWH (262-000)
Open a terminal on your device (Play Sore app that i have used)
type the following:
cat /sys/firmware/fuse/odm_reserved >/data/local/tmp/odm_reserved
after that edit the file odm_reserved loctated here: /data/local/tmp/
change the line that it reflects this one: 0x000000000000000000000000000000000000000000000000 00000040000000c8
save the changes, back to the terminal enter:
echo /data/local/tmp/odm_reserved >/sys/firmware/fuse/odm_reserved
than i used my PC (Phone connected via USB, USB-Debugging enabled) and entered
adb reboot bootloader
fastboot oem unlock
in a comand prompt
Press Vol Down, then Power Button from the Phone to unlock, screen went#s back, i waited 30Sec and rebootet
the phone, after that i rebootet back to the bootloader and installed the unsecure boot img and CWM.
And don't thank me - thx to Derjan23 for finding this out for us all!!!!!!!!!!!!!!