Add cleanup at start of script

RMxxx_rgmii_toolkit.sh

@@ -616,6 +616,9 @@ manage_reboot_timer() {
 
 # Main menu
 while true; do
+    echo "Cleaning up..."
+    rm /tmp/main.zip
+    rm -rf /tmp/quectel-rgmii-toolkit-main/
     echo "Welcome to iamromulan's RGMII Toolkit script for Quectel RMxxx Series modems!"
     echo "Select an option:"
     echo "1) Send AT Commands"