Android Kingslim unit external microphone hook up

[Romvert]

Hey guys, I'm having a frustrating time trying to figure out where to solder an external mic in this unit. I have tryied an FLTP mic in 3 places that say and could be the mic input with no success. Is there anyone that did this and it worked? If so where is the right spot to solder it and what type/brand of mic?
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[Rukbat]

Mic+ and mic- should take a condenser mic. (Mind the polarity.)

 

[Romvert]

Mic+ and mic- should take a condenser mic. (Mind the polarity.)

Unfortunately it does not. I tried in 3 places with that denomination. I'm trying mic+ and ground next.