RN104 "Boot from USB Failed!" and Cannot Access Boot Menu

Hi, it behaves the same way with or without the drives installed in it.  

I also tried StephenB's suggestion to create the USB Recovery Stick in enhanced (Administrator) mode.  I got the same results - the unit accesses the USB Recovery Stick and apparently runs the recovery program; unit powers off within a minute; restarting the unit provides the same failures.

I did some Google'ing and saw that the unit used a CR2032 battery, like a computer motherboard uses a coin battery to hold BIOS/CMOS settings.  I disassembled the unit and installed a known good CR22032 battery, reassembled the unit, and tried the USB Recovery Stick again.  Same results.  I also tried holding in the RESET button to call up the Boot Menu - no luck there.

The unit that failed (Unit A) is about 8 years old.  I have an identical unit (Unit B) that I have 4 1TB drives in.  I plan to remove those drives from Unit B, install the 4 4TB drives from Unit A, and see how Unit B reacts.  With luck, I haven't lost the data on the drives from Unit A and having those drives in Unit B will work fine.

The Google'ing also showed me the flash memory is soldered to the board.  I was hoping it was installed in a socket, but it's not so I'm not going to try and replace it.