chinese MISO S830... please help
 

dear mates, im having a big problem with a chinese phone for which im trying to formjat ffs... the problem is.. i cant get it connected. the phone name is MISO S830. i tried to connect with all different cables but none of did work. so i opened the phone and found the GROUND, RX, and TX pinouts inside the phone. i made one cable but still not connecting. please help. the phone is restarting when i put simcard

hello!

picture of RJ45.
count pins from up to down

pin 2 goes to RX_a
pin 3 goes to TX_a
pin 8 goes to GND (chassie)