Hi Adam. Look, I have a pull-up resistor to MCLR just like the specification sheet sugests, Iīm unsing a 10 Mhz Crystal and 33 pF capacitor. In fact I am changing the value of the crystal from 4 Mhz to 12 Mhz just that I also change te capacitors from 33 pF to 15pF because Iīm trying to get a baudrate of 115200, so thatīs the why Iīm experimenting with diferent crystals. And one more thing, I also found that when I connect the serial cable it always works, I figure thatīs because the external part of the serial cable is connected to gnd... what do you think?

Thanks a lot!