Were you able to fix this? I am having the exact same issue with the same display.
Tried to update the firmware on my Panasonic SA-BT-100 Blu ray player today. I burned the file onto a CD-R just like the panasonic site recommends. I know they say to be patient and it takes 45 mins etc but mines been going for 9 hours now.
The display is flashing a message saying "W DSP"
Can anyone help me?