The device is protected

[TrungNguyen]

My MCU is loaded with the test program at the supplier. But when I loaded the actual program, it did not allow me to erase or read the chip, and the device was protected.

[Stecklo]

There seems to be some option bytes programmed to protect the example code. Probably it's RDP == 0xBB. Setting it to 0xAA will allow you to flash your code, but the original demo will be erased forever

[TrungNguyen]

I did that and still couldn't.

[Tesla DeLorean]

Very little detail of board or connectivity.

Could be a connection issue.

Please try using the ST-LINK Utilities or STM32 Cube Programmer applications.

Describe the board.

Had success with this previously, or new board/design?

Does mass erase clear the RDP state?​

[TrungNguyen]

I got it to thank you.