The only current way to root 4.2 on these is using kingo root on a PC.
I'm working on TWRP recovery though, when I release it, I can look into providing a root only patch for stock 4.2.
FYI, installing TWRP recovery replaces the stock recovery. Italso requires modifying other parts of the stock ROM unless you flash it using one of the PC Rockchip flashing tools.
ShaunMT
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