Can be programmed only once! [solved]

[VaGyver]

Thanks for all the information!
Have you actually connect rts on the uart to mclr on the PIC?

If not, you need to manually reset the PIC before you write.

Yes, i do have connected the RTS.
When i press the 'check for bl', i don't need to reset manually the pic since it does it by itself (and it finds the pic by itself).

But for test reasons, i also tried to manuallyreset the pic with no difference, since it does reset it by itself via the RTS.