anyone explain :
High voltage programmer can reset lock bits without loosing code or program from atmega328?
No, the current code in the flash will be deleted
Otherwise there would be no point in lock bits
From the Atmega328 datasheet (chapter 26.5):
Lock bits can be set in software in Serial or Parallel Programming mode, but they can be cleared by a Chip Erase command only.
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To do this you need to edit bootloader first. But you can't if the lock bits forbids it.
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please see in this video programmer jumper prevent the code.
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