I have seen this bit in the datasheet. This bit must be set to jump to the user application. If this bit is cleared, the controller will start the bootloader. Maybe the datasheet is wrong and they have switched the function of this bit. But i have looked in some other datasheets and the logic of this bit is there the same.
I can try to reset the bit, but im afraid of getting no connection to the controller once i've reset the bit.

Greetz
Alex