Why it's not possible to make a firmware update of the PCD7.D457VTCF and PCD7.D457VMCF TFT VGA MB panels?

FAQ #101088

 

Solution:
in this case, use the safety procedure (always with USB connection).

Procedure:
A. Power off the MB-Panel
B. On the Top of the Back Cover there is a hole of 3mm diameter. Inside there is a button.
Take a fine pen or a little screwdriver (the best is a cylinder with diametr 3mm) and press continuously (hold it) on that button. 
C. Then at the same time Power ON the MB-Panel. Wait about 3-4 sec. until the LED on the TCP/IP connector is flashing.  
Then Download the FW  V1.00.00 with the SBC firmware download utility of PG5®.

This procedure is also describe in the manual&user's guide.26/858 PE1 chapter 13.2.1 (with Photos)