You can install using the backup and upgrade thats the only way it worked for me but to reboot into recovery with android use adb and type in reboot recovery. Need to be rooted to use ad b.
As for the burning tool no you do not need recover. All i have to do is start the app on my computer load the image and click start, then plug in the usb cable into the box. You don't need power the usb port will power the box during flash.
Oh god...thank you very much This procedure seem a little bit unlogical to me. But it worked like a charm. I've manage to reinstall some firmware for this device and using "Backup&Recover" install LE. Now I need to check how it works in terms of playing movies.