I had to reinstall Win 10 on my NUC7i5BNK, so I decided to update BIOS too. I updated it from v. 54 to 60, reinstalled Windows and I cannot start my NUC by TV anymore. Other HDMI-CEC functions work OK (NUC is switched off with the TV and TV is switched on, when NUC is booting after press of the power button). It worked like a charm before the update... Any suggestions? Thank you.
Have you looked to make sure that all of your (BIOS Configuration) settings for CEC actually survived the BIOS Update process? In some cases, depending upon the types of changes that had to occur across these six BIOS updates, settings could be reset/modified.