Headless Upgrade? 6.4 to 7.0

Hi,

I am looking to upgrade from 6.4-13 to 7.0.

I saw an upgrade guide that seemed pretty much using command line - BUT demanded a keyboard type Language confirmation on boot...

...I have no (current) mouse/keyboard/screen attached to my Proxmox (it is "back-end" )...

Question is if this keyboard confirmation is needed physically on first boot on 7.0 or if real headless upgrade is possible?

Thank you!