1- Printer is giving an error when power is turned on. Error (016-387) on Printers LCD it reflects as it is downloaded some software from USB and it goes to 100% and error appears. 

USB - Error (016-387)
Panel Module

Tried to login into DIAG Mode by holding 456 and password 225 and it says please wait and then instead of going into DIAG Mode restarts . 
Tried to update Firmware with USB and it says Sending the data but nothing happens.
Tried to do same through Network but nothing. 
Unplugged, power cable, Network Cable, USB Cable, even lithium cell from the mainboard.

Same issue. 

Any ideas which could help me. 

Thanks