remove local busybox, downloaded now from official source

setup.sh

@@ -15,7 +15,7 @@ echo "Create SD Card root directory"
 mkdir SD_ROOT
 
 echo "Copy utils to SD_ROOT"
-cp busybox SD_ROOT
+wget https://www.busybox.net/downloads/binaries/1.21.1/busybox-mipsel -O SD_ROOT/busybox
 cp dropbearmulti SD_ROOT
 
 echo "Download latest rootfs firmware $LATEST_ROOTFS"