"There is a problem. The 9X pins to the module output about 5 volts which is all thats required for 2.4Ghz.  The FM modules use 6 volts so that might cause problems.  Check out the er9x thread on RC Groups - maybe someone there has an idea."

"Guy's have commented that 16 model memories are not enough but at that price one can buy another! When I look at the price of my JR 8310 from a few years ago and the functionality of the 9X it is such a bargain that I will buy another :)"

"This is a real bargain for the money.  The change from mode1 to mode2/3/4 is done in the menu and the hardware change is simply opening the back and swapping the throttle drag plate thing with the spring on the other side.  Buy the mode1 and convert…"