to update the firmware, put the contents of the zip files on the SD card:
X:\System\update
it should have a series of *.bin and *.dat files (like boot.bin, kernel.bin etc)
restart the dr800, and it should automatically update...
RC4 is the unofficial one, that has a real "turn off device" feature. After 24 hrs it will turn off completely... this means it must do a complete reboot after that, but it will save the battery
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Wuala will stop in November 2015 all together...
Luckily there's Google Drive:
The new link is: Google Drive
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