calamaresrellenos
Vu+ User
Subtitute actual busybox running on your Vu+DUO and other .
1º/ Download this file (busybox-vuduo.zp) attached . MD5 code = 886cc9580292204d53958f1585a6b241
With DDC2 upload file descompresed to example /media/usb
Your have /media/usb/busybox-vuduo
2º/ Change file attribute ;
chmod 0755 busybox-vuduo
3º/ Execute example ;
./busybox-vuduo
More command have found
4º/ Optional create this link ln -s /media/usb/busybox-vuduo /usr/bin/busybox-vuduo
Best regards . 
P.S. Sorry my bad English .