in a differnt post, I found instructions to copy RFU file via USB and DOS commands..
took me a while to figure it out..
thank you to referenence to/at LaserPros.com.
the RFU file copied... but, the system did not reboot.
here is DOS Text:
Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\>copy /b C:\Users\dude148\Desktop\ljcp3505fw_03.150.1.rfu \\dude148-PC\momprinter 1 file(s) copied.
Any other suggestions?