I have been unsuccessful in installing the Rockchip driver on my Windows 8.1 HP Latop. After many attempts (manual or automatic install, use of WinXP with VirtualBox), I tried with Linux. I first tried with RkFlashKit but my device was partially bricked (no more starting). I tried again and realized (feedback from RkFlashKit) there may be a problem with the NAND memory and have to format it. Then I found this:http://wiki.radxa.com/Rock/flash_the_image
and use the following commands:
--> to format
sudo ./upgrade_tool lf #(LF Lowlevel Format)
--> to upgrade:
sudo ./upgrade_tool uf /path/to/update.img #(UF Upgrade Flash)
To make it work, I had to maintain Power and vol+ buttons just before and a few seconds after typing the command. I had to format twice before getting a successful upgrading report.
Now my device works perfectly with the Legacy firmware...