In ./advanced/Scripts/utils.sh line 91:

if [[ $? -eq 5 ]]; then
     ^------------^ SC3010 (warning): In POSIX sh, [[ ]] is undefined.

Signed-off-by: Adam Warner <me@adamwarner.co.uk>

advanced/Scripts/utils.sh

@@ -88,8 +88,8 @@ getFTLConfigValue(){
 #######################
 setFTLConfigValue(){
   pihole-FTL --config "${1}" "${2}" >/dev/null
-  if [[ $? -eq 5 ]]; then
-    echo -e "  ${CROSS} ${1} set by environment variable. Please unset it to use this function"
+  if [ $? -eq 5 ]; then
+    printf "  %s %s set by environment variable. Please unset it to use this function\n" "${CROSS}" "${1}"
     exit 5
   fi
 }