Bootloader remains active and OEM unlocking is greyed out

Hi all and HNY!

First attempt here. After flashing the boot loader remains the first thing to show up after power on and I cannot seem to disable the OEM unlocking switch as it is greyed out.

Also I cannot seem to connect via ADB or fastboot anymore to my Oneplus 5T.

What am I missing and doing wrong?

Any help very much appreciated!

Kind regards,


Sometimes it should help to log in with a Google account in Android to enable OEM unlocking.