HP LaserJet Enterprise 600 Printer M603 series - Manual (Page 49)

USB Firmware Upgrade menu
To display: At the product control panel, press the Home button, select the Device
Maintenance menu, and then select the USB Firmware Upgrade menu.
Insert a USB storage device with a firmware upgrade bundle into the USB port, and follow the on-
screen instructions.
Service menu
To display: At the product control panel, press the Home button, select the Device
Maintenance menu, and then select the Service menu.
The Service menu is locked and requires a PIN for access. This menu is intended for use by authorized
service personnel.
ENWW Device Maintenance menu 33