> writing to the flash by accident. This is very hard to do
> accidentally so you may have made a mistake in writing
> to data EEPROM

You'd think so, because of the required write sequence

> > I am not sure how many %

Read the chip and see what's been corrupted and where

> > I ended up reprogramming pic fixed the problem

Can you use MCLR to try a reset ? It's possible the code
has just gone off into space




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