Update S58factoryreset

files/services/S58factoryreset

@@ -12,7 +12,12 @@ factory_reset() {
     ACTION=stop /usr/bin/auto_uvc.sh >/dev/null 2>&1
     echo "Info: Factory reset was executed successfully, the printer will restart..."
     /etc/init.d/rcK >/dev/null 2>&1
-    /bin/rm -rf /overlay/upper/* >/dev/null 2>&1
+    /usr/bin/find /overlay/upper/ -path '/overlay/upper/etc/dropbear' -prune -o \
+        -path /overlay/upper/etc/init.d/S58factoryreset -o \
+        -exec rm {} \; >/dev/null 2>&1
+    /usr/bin/find /overlay/upper/ -type d \
+        -depth -print \
+        -exec rmdir {} \; >/dev/null 2>&1
     /usr/bin/find /usr/data/ \
         -path '/usr/data/creality' -prune -o \
         -path '/usr/data/wpa_supplicant.conf' -prune -o \