Hi there, I need to add more the function based on Bluetooth, and I need the better security of the function. However, I do not want others read flash data freely and I hope only through my certification could the protocol stack jump to the bootloader address or modified the bootloader address. Can you provide the code of protocol stack? Which part of the code could I modified if I add the security certification? By the way, I don’t need to modify the communication part of the Bluetooth. Any help would be greatly appreciated!