- Press DISK button.
- Select Utilities.
- Select Copy System (or Load System).
- Insert disk containing the new OS file.
- Select the file and confirm the update. Warning: Do not power off during update.
Source: E6400 Ultra — e-mu-eos-4-0-manual (manual)
Symptoms this guide addresses
Source: E6400 Ultra — e-mu-eos-4-0-manual (manual)