this command:</p><pre><code class=language-bash data-expandlinks=true data-repo=istio>$ istioctl upgrade
</code></pre><div><aside class="callout warning"><div class=type><svg class="large-icon"><use xlink:href="/v1.17/img/icons.svg#callout-warning"/></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