ng"/></svg></div><div class=content>If you installed Istio using the <code>-f</code> flag, for example
<code>istioctl install -f &lt;IstioOperator-custom-resource-definition-file></code>,
then you must provide the same <code>-f</code> flag value to the <code>istioctl upgrade</code> command.</div></aside></div><p>If you installed Istio using <code>--set</code> flags, ensure that you pass the same <code>--set</code> flags to upgrade,
otherwise the customizations done with <code>--set</code> will be reverted. 