I'll make a how to if you want. But it was simple.
First thing I did was pop off the sheild
Then found the the #39 (I think that is the number) restior . Then I removed it by just popping it off with a exacto blade
Make sure nothing is touching the sheild
Place sheild back on
Then soldier a sma to lna by pass .
Then shorted the s14 spot. (I think that's it)
Then I just plugged it in to my rpi3
Found what device it was. Assigned it to my dump1090
Boom.. but that's the logistics of it.
BTW this is from memory. As I'm not at my house with the sdrx in front of me.