Afreen, The P1x series (and the Px4 before it) is particularly susceptible to user lockout due to invalid option bytes being programmed. (If I had to guess, I'd say that it's probably a mixture of security mechanisms and strict operating ranges that causes this.) If a full chip erase doesn't restore it, and you are unable to attach with a debugger, please pay careful attention to the option bytes on the next chip. Best regards, Scott
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