[waltdp]

I believe that is what I have done. i extracted the files from post #2 again. I copy RUU_signed.nbh to root of sd card and rename it to RHODIMG.nbh. Press vol down, power and end buttons to get the bootloader screen. when the grey screen came up, it asks to update the bootloader SW by pressing power. After pressing power, it reset with an error on the bootloader screen and switches to grey screen saying "loading..."

Did I use the correct nbh?