Found pinout for KA09 with my multimeter :-)
1 - Charge (+5V)
2 - Vbat
3 - Tx
4 - Rx
5 -
6 -
7 - USB Data-
8 - USB Data+
9 - GND
10,11,12 are for headset (non tested, will be done in future, maybe...)
Under battery cover, near SIM1 socket, are "test points", labelled (from top...) RX, TX...