PLAYUAV BL

Inexplicably after connecting my PLAYUAV to rectify some of the setup, the OSD does not work. When reconnected to the PC it recognizes it as PLAYUAV BL (Bootloader)? , The application on the computer gives me a connection error on the serial port. How can you fix this situation. I have the OSD unusable, I would appreciate if you would give me instructions to restore its functioning. Thank you very much.