use the applets of the provided static Busybox binary as often as possible and call them with absolute path references to minimize the chances to call a wrong command/applet
solved with b5542dc593f46d0569d0f4e464d9497332a23fec
the sometimes different "blkid" command, which leads to unexpected behaviour of the script, was replaced with "peeping" into the image files (with "testvalue") and searching for known signatures
the following commands are still used from vendor's firmware:
use the applets of the provided static Busybox binary as often as possible and call them with absolute path references to minimize the chances to call a wrong command/applet