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It would be fairly hard to remove and re-solder the 18F4455 device by hand
I've done that many times in my last job and the muxers are easy to source, but anyway, I understand your policy.

Another thing, I often had problems while testing the programmed chip on the eval. board, because of a lack ...

Hello,
after one of my students put 14V on one of the "+V" connection of the board, the PIC18F4455 has burnt.
Is there a way to have the hex content of this processor or a programmed one in order to replace the dead one ?
Regards,
sperate.