Strange... I have 450 and 600 also...
Try flashing the firmware again.
And be sure the firmware on your 2 in 1 box is also 101224 (V1.07_101224 if I'm correct).....
Maybe the problem lies there...
OK find solution, I cannot change the setting over 350 on my computer but it can be changed via the 2 in 1 box, so problem sorted, thanks guys