Good ideas.

i didn't check the whole thing
How can I support you in doing so ?

Your PIC i/o is dead OR there's a bad contact.
Having replaced the PIC I don't think so. I usually press it gently but firmly in the socket. Sometimes I even press when running.

And i posted a link before in post #2 about the config fuses.
Having read it fully, I will comment that. After my first impression it is just a summary of what fuses are possible. I think I am limited to the ones MPLAB offers ?! Additionally most settings are set to work in most cases so do you suggest focusing on something special for this issue ?