Thanks for the replies!
I upgraded from 5.1.0 to 6.0 via ISO file on USB Stick. I plan do that also for the 6.5 Upgrade.
The drivers seem to be for the RAID Controller...it does not seem smart to remove them? Will the ESX 6.5 Setup still recognize the installed 6.0 System and just upgrade it?
I want to avoid losing my VM's....
Many thanks,
Markus