I am to use MSP430F5247 for a mass production device. I would like it to lock the JTAG communication so no one customer can read or write on the Flash of the microcontroller. Nevertheless, for customer service reasons, we still need to have access to the Flash through JTAG for updating firmware if necessary. Therefore, blowing fuses do not fulfill our requirements because that is a permanent solution for stopping JTAG communication. Is there any other way to secure the device without blowing the fuses or using BSL?