I was able to get this working with my proxmox server, however you need to be comfortable with editing the .conf files. This is off the top of my head here…
The (basic) steps I followed were:
1- Download the amd64 usb image (mine was balena-cloud-rosetta-at-home-amd64-genericx86-64-ext-2.48.0+rev5-v10.8.0)
2- create a new proxmox vm with > 4G ram and an IDE drive with 32G space
3- Upload the usb image as an ISO (yes, weird)
4- Attach the ISO file to your new VM (do not start yet)
5- Shell to your proxmox server
6- edit your conf (mine was /etc/pve/qemu-server/400.conf) and change the cdrom image to an ide image
7- Change the settings to boot to the second ide image
8- Start the VM. It will open, show the balena graphic and then seem to go into a reboot cycle. Let it restarts once as this is when it formats the hard drive
9- Stop the VM
10 - Remove the second hard drive image (balena)
11- set the boot drive to ide0
12 - Start the image
I believe all I did in step 6 was remove the “media=cdrom” option from the ide1 config line.
HTH