diff --git a/ansible-kvm-vms/roles/os_config/templates/ignition.json.j2 b/ansible-kvm-vms/roles/os_config/templates/ignition.json.j2
index acad839..f0843d8 100644
--- a/ansible-kvm-vms/roles/os_config/templates/ignition.json.j2
+++ b/ansible-kvm-vms/roles/os_config/templates/ignition.json.j2
@@ -1,6 +1,6 @@
 {
   "ignition": {
-    "version": "3.3.0"
+    "version": "3.0.0"
   },
   "passwd": {
     "users": [
diff --git a/ansible-kvm-vms/roles/vm_provision/tasks/main.yml b/ansible-kvm-vms/roles/vm_provision/tasks/main.yml
index 100ff27..4a979c0 100644
--- a/ansible-kvm-vms/roles/vm_provision/tasks/main.yml
+++ b/ansible-kvm-vms/roles/vm_provision/tasks/main.yml
@@ -48,7 +48,8 @@
 - name: Remove existing VM definition
   shell: |
     virsh destroy {{ vm_name }} || true
-    virsh undefine {{ vm_name }} || true
+    virsh undefine {{ vm_name }} --nvram || true
+    rm -f /etc/libvirt/qemu/{{ vm_name }}.xml
   become: yes
 
 - name: Provision VM using virt-install
diff --git a/ansible-kvm-vms/vars/vms.yml b/ansible-kvm-vms/vars/vms.yml
index dc34d7e..8a82ae0 100644
--- a/ansible-kvm-vms/vars/vms.yml
+++ b/ansible-kvm-vms/vars/vms.yml
@@ -11,15 +11,15 @@ vms:
   - name: flatcar-vm
     os_type: flatcar
     os_variant: "fedora-coreos-stable"
-    disk_bus: "sata"
+    disk_bus: "virtio"
     cpu: 2
     ram: 2048
     disk: "20G"
 
   - name: microos-vm
     os_type: microos
-    os_variant: "opensusemicroos"
-    disk_bus: "sata"
+    os_variant: "generic"
+    disk_bus: "virtio"
     cpu: 2
     ram: 2048
     disk: "20G"