I recommend the upgrade components part can sell in one package with upgrade manual. Also, frsky can consider to have own taobao shop or Agent taobao shop to sell most updated product, or replacement parts of X9D
Joy dial function ( like Futaba FF9)http://www.rc-airplane-advisor.com/imag ... y-dial.jpg
Fail safe setting warning
if user do not set throttle to -100%, during set X9R type receiver, warning should given before confirm, since some old style user like me, just put all stick in desired position and press set. this is wrong.
Or you may default the throttle position to -100 in the fail safe setting page, not 0
Or X9D can automatically read stick position in fail safe setting page
Vibration strength level can let user to set
Touch screen can be consider, but please ensure with lock function
Can you produce a protection screen for X9D? I want to protect my large and beautiful X9D screen
Please develop Futaba style module converter, because many user using futaba rather than JR, they have a lot of futaba module or frsky module in futaba style
Like this onehttp://www.flytron.com/123-897-thickbox ... dapter.jpg
One new function recommandation in receiver
I recommand to add a new port for backup battery in receiver.
In case of ESC or UBEC power failure accidentially, plane will lost control and make accident. I recommend frsky can consider to develope a power backup port in advance receiver like X8R. So we can plug a little backup battery to backup port. When receiver detect BEC voltage drop to accidentally level, like 4.5v or lower, receiver can automatically switch the power supply from backup power port and make warning to X9D. So that even throttle is down, we can still able to control sevro to glide our plane to land.
Other than that, frsky can consider to develop 433 plus GSM module, and receiver more that 10ch, because L9R is not enough for long range fpv
Please develop 10ch + receiver with smart port, x8r is not enough channel, but it is costly to buy two receivers for 16channel. Heavy and need space