Con fred9922/12/2017With the new documentation of it's creator, Pascal Langer, this module is easy to flash via the USB port : https://github.com/pascallanger/DIY-Multiprotocol-TX-Module/blob/master/docs/Compiling_STM32.md
Con old457004/12/2017I just had to have the IRX4+ after having owned the IRX4 for several months . I only have the Flysky 9x with stock factory firmware that the IRX4+ can plug into . And it does plug in with no issues . The IRX4+ case has been changed / upgraded to allow insertion into the back of the 9x ( Flysky ) .
I was easily able to bind the 9x to my JJRC H36 and have a quick fly . I then put the IRX4+ in my Taranis Q x7 and flew the JJRC H36 again .
If you are looking for a multi protocol module for your 9x