NEC VERSA FX Manual page 63

Locate the dip switch block. Using a fine-tipped object, change switch 5 to "ON"
4.
to enable the BIOS flash.
the pencil can damage the system.
Note
need to install/replace SO-DIMM modules, you might want to do so while the system is
already disassembled.
Replace the memory module bay cover and screw.
5.
Turn over the system.
6.
7. Follow the instructions later in this chapter, "Performing the BIOS Update."
3-24 Using the BIOS Setup Utility
Never use a pencil to change switch settings. Residue from
BIOS flash switch enabled
Dip switches 2, 3, 4, and 5 set to "On."
The system memory expansion slot is also located here. Therefore, if you