Problem: Unable to download code using ISP/J-Link/ST-Link, etc., prompting that the chip is write-protected; prompting that read protection is displayed when reading chip information.
Cause: Usually the option bytes have been modified.
Solution: Here, use ST-Link Utility to modify the option bytes.
Use ST-Link to connect to the STM32 chip and click Connect.
Read protection exists.
Modify option bytes.
Change the read protection level to Level 0.
The sectors with a check will be write-protected. Click Unselect all to uncheck the write protection.
The Flash will be erased after writing the option bytes.
The program can be written normally.
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