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I Have added
FLASH_Unlock(); FLASH_ReadOutProtection(ENABLE); FLASH_Lock();
to my code and unfortunately it has locked my micro-controller. I use Manage Enviroment run time window to add "Flash" library to my project and I can't access to stm32 opt files individually to erease protection bits. Please Help me
You could try and add the Options Bytes as an additional Flash Algorithm, and then use the Flash->Erase menu.
Better not to lock down the part in the first place, or code an exit strategy to mass erase the part.
The J-Link has a stand-alone STM32 tools also.