In USB memory stick,
make \\vuplus\solo\ folder and copy the following 3 files to that location
1) root_cfe_auto.jffs2
2) kernel_cfe_auto.bin
3) boot_cfe_auto.jffs2
Insert USB Memory stick into the front USB socket and then Power Off and Power On again.
After power-on, VuPlus SOLO automatically start upgrade using the files in the USB memory stick.
When upgrade is finished, the GREEN LED on front side blinks continuously.
Remove the memory stick and power off and on again.
All info you can find here
http://vuplus.com/?page_id=6
If you using BH image
You have to download usb image version first format your USB stick on your PC FAT32
COPY all folders from USB BH image version and you can flash your box.
Insert USB Memory stick into the front USB socket and then Power Off and Power On again.
After power-on, VuPlus SOLO automatically start upgrade using the files in the USB memory stick.
When upgrade is finished, the GREEN LED on front side blinks continuously.
Remove the memory stick and power off and on again.