Function key F8 not working at start-up

Hi,

I received a lot of information on that tread by several members (many thanks for it) but still I couldn't solve it.

I know that that due too the fast startup that function doesn't work no more by some users.

I introduced the correction

bcdedit /set {default} bootmenupolicy legacy
and strang sometimes it is working
I checked via bcdedit if the command is really active
The behaviour is the same even when additionally i remove the fast start-up function.

I have a full SSD-drive ...could that be the reason?

I am wondering why sometimes (mostly never) it is working and if it works than also the longer method via PCSetting and so is fine.

Regards
RitaHubert