proxmox ve 4.4-5's virtio scsi's broken, how to downgrade?

[rampage]

proxmox ve 4.4-5's virtio scsi's broken, how to downgrade?

Issue
https://forum.proxmox.com/threads/proxmox-4-4-virtio_scsi-regression.31471/

How to downgrade to a lower version, without backing up the vm files and confs?

 

[rampage]

Update:
Temporary fix:
https://forum.proxmox.com/threads/proxmox-4-4-virtio_scsi-regression.31471
post #18 #19