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: Manually run the Unprotect command first, wait 5 seconds, then select Erase . If it continues to fail, the chip may have reached the end of its operational lifespan and entered a permanent, hardware-locked read-only state.

is a widely used, portable open-source software designed for programming EEPROM and Flash memory chips, typically using hardware like the CH341A programmer . asprogrammer 21013 download 39link39 work