diff --git a/firmware-util.sh b/firmware-util.sh
index eb7047d..0069ed5 100644
--- a/firmware-util.sh
+++ b/firmware-util.sh
@@ -26,8 +26,8 @@ else
 	cd /tmp
 fi
 
-#check for cmd line param
-if [[ "$1" = "-k" ]]; then
+#check for cmd line param, expired CrOS certs
+if ! curl -sLo /dev/null https://mrchromebox.tech/index.html || [[ "$1" = "-k" ]]; then
 	export CURL="curl -k"
 else
 	export CURL="curl"
diff --git a/setup-kodi.sh b/setup-kodi.sh
index 5f06fc2..e37ab3b 100644
--- a/setup-kodi.sh
+++ b/setup-kodi.sh
@@ -22,8 +22,8 @@ else
 	cd /tmp
 fi
 
-#check for cmd line param
-if [[ "$1" = "-k" ]]; then
+#check for cmd line param, expired CrOS certs
+if ! curl -sLo /dev/null https://mrchromebox.tech/index.html || [[ "$1" = "-k" ]]; then
 	export CURL="curl -k"
 else
 	export CURL="curl"
diff --git a/uefi-flash.sh b/uefi-flash.sh
index da24472..5578a5a 100644
--- a/uefi-flash.sh
+++ b/uefi-flash.sh
@@ -26,8 +26,8 @@ else
 	cd /tmp
 fi
 
-#check for cmd line param
-if [[ "$1" = "-k" ]]; then
+#check for cmd line param, expired CrOS certs
+if ! curl -sLo /dev/null https://mrchromebox.tech/index.html || [[ "$1" = "-k" ]]; then
 	export CURL="curl -k"
 else
 	export CURL="curl"