How to reset PIC18F4550 to factory default?

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TryToLearnMore

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Hi, guys, i need some help here...

before i program my own coding into the pic, the pic working well with the sample code i found on the website. however, after i did some changing on the sample code, the pic looks like KIA. it can't detected by pc anymore (my project is using pc to control motor through pic) even i reprogrammed the sample code into it (but the pic still can be detected by programmer). i think i might changed the default value of the pic, but not sure.

anyone can help me out? is it true i already changed the default value of the pic or other problem cause that?
 

If your programmer can not detect the chip, you might have blown it.
 

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