Index: package/base-files/files/sbin/sysupgrade
===================================================================
--- package/base-files/files/sbin/sysupgrade	(Revision 35186)
+++ package/base-files/files/sbin/sysupgrade	(Arbeitskopie)
@@ -76,6 +76,15 @@
 	exit 1
 }
 
+if [ "$SAVE_CONFIG" = "1" -a "$FORCE" = "0" ]; then
+    echo "Please let the image serve you with a new config."
+    echo "Use -n flag to get the new config!"
+    echo ""
+    echo "If you don't want to flash a Freifunk-Image you can force"
+    echo "a sysupgrade without -n using the -F parameter."
+    exit 1
+fi
+
 [ -n "$ARGV" -a -n "$NEED_IMAGE" ] && {
 	cat <<-EOF
 		-b|--create-backup and -r|--restore-backup do not perform a firmware upgrade.