System Software Update

Symptoms this guide addresses

Load the SysEx file into a MIDI sequencer/computer.
Set the MicroWave to Global Mode.
Set Parameter receive to On.
Press the Utility key (f) while holding Shift (k).
Turn the Page Dial (c) to Software Update.
Press the Utility key (f) while holding Shift (k) again to enter update mode.
Send the SysEx file from the computer.
Wait for the MicroWave to reboot automatically.

Source: Microwave II — wdf007.raw (manual)