Windows 10 EFI boot problem "Press any key to boot from CD or DVD"

Packer
1

I’m using the Packer Builder for VMware vSphere (vsphere-iso) creation and tried to install Windows 10 using an EFI firmware. First I’ve got the boot manager, when selecting the EFI VMware Virtual SATA CDROM drive the message “Press any key to boot from CD or DVD” appears. When pressing “enter” the setup starts. Is there a way to automatically start the Windows 10 installation without modifying the Windows ISO?

2

I know this article is very old, but I stumbled acoss it.
The reason is: I was messing with packer and hyper-v in my homelab and did not have a solution for the same problem.

I had the following situation:
Packer appeared to be to slow for hitting the button in time.
I looked into making better images with dism, trying to deactivate the message and stuff. However, the solution was more simple:

The solution was for me: Set “boot wait to -1 second.” This will avoid the wait time, as described in the docs from the hyper-v.
Now the machine will give the command in time.

source "hyperv-iso" "windows-server-2022" {
  boot_command = ["f u n w i t h p a c k e r"]
  boot_wait    = "-1s" #Set to -1s to disable waiting for the boot menu - This may trick the "press any key to boot from dvd"

#I this example I am loading the autounatteneded.xml via secondary iso: 
secondary_iso_images = [
        "./answer.iso"
      ]
  iso_url      = "file://D:/VM/ISO/WS2022_SERVER_EVAL_x64FRE_en-us.iso"
  first_boot_device = "DVD"

the actual boot command does not really madder. I just want to have fun with packer :wink:
Autounattend takes over headless. If you have something displaying there, than you may not frog around with the command and be a little serious.
Hopefully it helps somebody else who stumbles across this question.