diff --git a/charts/kubezero-istio/upgrade_istio_18.sh b/charts/kubezero-istio/upgrade_istio_18.sh
deleted file mode 100755
index 038b40e..0000000
--- a/charts/kubezero-istio/upgrade_istio_18.sh
+++ /dev/null
@@ -1,14 +0,0 @@
-#!/bin/bash
-
-# Remove operator first
-kubectl delete deployment istio-operator -n istio-operator
-kubectl delete ns istio-operator
-
-# Remove policy
-kubectl delete deployment istio-policy -n istio-system
-
-# Install new istio and istio-ingress chart
-
-# Remobe old ingress
-kubectl delete deployment istio-ingressgateway -n istio-system
-kubectl delete deployment istio-private-ingressgateway -n istio-system
diff --git a/charts/kubezero/bootstrap.sh b/charts/kubezero/bootstrap.sh
index 3b50a62..ab748e0 100755
--- a/charts/kubezero/bootstrap.sh
+++ b/charts/kubezero/bootstrap.sh
@@ -2,7 +2,7 @@
 set -ex
 
 ACTION=$1
-ARTIFACTS=("$2")
+ARTIFACTS=($(echo $2 | tr "," "\n"))
 CLUSTER=$3
 LOCATION=${4:-""}
 
@@ -99,10 +99,9 @@ function _helm() {
 
   if [ $action == "crds" ]; then
     _crds
-  else
-
+  elif [ $action == "apply" ]; then
     # namespace must exist prior to apply
-    [ $action == "apply" ] && create_ns $namespace
+    create_ns $namespace
 
     # Optional pre hook
     declare -F ${release}-pre && ${release}-pre
@@ -112,8 +111,11 @@ function _helm() {
     # Optional post hook
     declare -F ${release}-post && ${release}-post
 
+  elif [ $action == "delete" ]; then
+    apply
+
     # Delete dedicated namespace if not kube-system
-    [ $action == "delete" ] && delete_ns $namespace
+    delete_ns $namespace
   fi
 
   return 0
diff --git a/charts/kubezero/scripts/delete_istio_17.sh b/charts/kubezero/scripts/delete_istio_17.sh
new file mode 100755
index 0000000..6ea378a
--- /dev/null
+++ b/charts/kubezero/scripts/delete_istio_17.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# Istio operator resources first
+kubectl delete Istiooperators kubezero-istio -n istio-system
+kubectl delete Istiooperators kubezero-istio-private-ingress -n istio-system
+
+# Istio operator itself
+kubectl delete deployment istio-operator -n istio-operator
+kubectl delete ns istio-operator
+
+# Remove policy pod
+kubectl delete deployment istio-policy -n istio-system
+
+# Remove old gateways
+kubectl delete gateways ingressgateway -n istio-system
+kubectl delete gateways private-ingressgateway -n istio-system
+
+# Remove old shared public cert
+kubectl delete certificate public-ingress-cert -n istio-system
diff --git a/charts/kubezero/scripts/patch_vs.sh b/charts/kubezero/scripts/patch_vs.sh
new file mode 100755
index 0000000..97b67f4
--- /dev/null
+++ b/charts/kubezero/scripts/patch_vs.sh
@@ -0,0 +1,19 @@
+#!/bin/bash -x
+
+# Get all public vs
+for vs in $(kubectl get vs -A | grep "istio-system/ingressgateway" | awk '{print $1 ":" $2}'); do
+  ns=${vs%%:*}
+  name=${vs##*:}
+
+  kubectl patch virtualservice $name -n $ns --type=json \
+  -p='[{"op": "replace", "path": "/spec/gateways/0", "value":"istio-ingress/ingressgateway"}]'
+done
+
+# Get all private vs
+for vs in $(kubectl get vs -A | grep "istio-system/private-ingressgateway" | awk '{print $1 ":" $2}'); do
+  ns=${vs%%:*}
+  name=${vs##*:}
+
+  kubectl patch virtualservice $name -n $ns --type=json \
+  -p='[{"op": "replace", "path": "/spec/gateways/0", "value":"istio-ingress/private-ingressgateway"}]'
+done
diff --git a/charts/kubezero/scripts/remove_argo_ns.sh b/charts/kubezero/scripts/remove_argo_ns.sh
new file mode 100755
index 0000000..4b97297
--- /dev/null
+++ b/charts/kubezero/scripts/remove_argo_ns.sh
@@ -0,0 +1,7 @@
+#!/bin/bash
+
+ns=$(kubectl get ns -l argocd.argoproj.io/instance | grep -v NAME | awk '{print $1}')
+
+for n in $ns; do
+  kubectl label --overwrite namespace $n 'argocd.argoproj.io/instance-'
+done
diff --git a/docs/Upgrade.md b/docs/Upgrade.md
index 4b84a00..3fd65a1 100644
--- a/docs/Upgrade.md
+++ b/docs/Upgrade.md
@@ -1,18 +1,44 @@
 # Upgrade to KubeZero V2(Argoless)
 
-- disable all auto-sync in argo !! ( remove auto-sync from old values.yaml and run deploy one last time ) or disable manual via Argo UI starting with Kubezero app itself
+## ArgoCD prep
+- disable all auto-sync and "prune" feature to prevent that namespaces defined in previous apps get removed
+  - either remove auto-sync from old values.yaml and run deploy one last time, trigger kubezero sync !
+  - or disable manual via Argo UI starting with Kubezero app itself
 
 - uninstall argo helm chart
   `helm uninstall kubezero -n argocd`
+- remove all "argocd.argoproj.io/instance" labels from namespaces to prevent namespace removal later on
+  `scripts/remove_argo_ns.sh`
 
 - migrate values.yaml to new structure, adapt as needed
-- update new central kubezero location in git and merge cluster configs
+  & update new central kubezero location in git and merge cluster configs
 
 - Upgrade control plane nodes / worker nodes
 
 - upgrade all crds
-- upgrade calico,cert-manager,kiam,csi drivers
-- Istio: 
+  `./bootstrap.sh crds all clusters/$CLUSTER ../../../kubezero/charts`
+
+- upgrade base artifacts
+  `./bootstrap.sh deploy calico,cert-manager,kiam,aws-ebs-csi-driver,aws-efs-csi-driver clusters/$CLUSTER ../../../kubezero/charts`
+
+- Istio, due to changes of the ingress namespace we need brief downtime
+DOWNTIME STARTS !
+  - delete istio operators, to remove all pieces, remove operator itself
+   `./scripts/delete_istio_17.sh`
+  - deploy istio and istio-ingress via bootstrap.sh
+  `./bootstrap.sh deploy all clusters/$CLUSTER ../../../kubezero/charts`
+  - patch all VirtualServices via script to new namespace
+  `./scripts/patch_vs.sh`
+DOWNTIME ENDS !
+
+- upgrade all artifacts
+  `./bootstrap.sh deploy all clusters/$CLUSTER ../../../kubezero/charts`
+
+- push kubezero cluster config
+- verify argocd incl. kubezero app
+- verify all argo apps
+- verify all the things
+
 
 ## High level / Admin changes
 - ArgoCD is now optional
@@ -50,6 +76,6 @@
 ### Istio
 - operator removed, deployment migrated to helm, cleanups
 - version bump to 1.8
-- no more policy by default
+- no more policy pod by default
 - all ingress in dedicated new namespace istio-ingress as well as dedicated helm chart
 - set priorty class