Voice Systems Data Filer Operating Manual page 88

After the check, the instrument will save the new firmware definitively in the its own internal
memory:
and then check it again:
The saving and verification procedures are very delicate phases in which the instrument is
virtually without an operating system. It is therefore essential NOT TO SWITCH THE
INSTRUMENT OFF during these phases.
When the procedure has been concluded correctly, the display will show the video page:
NOTES
ü The file containing the operating system is called Datafile.sys. Never rename it.
ü If the message SYSTEM FILE ERROR is displayed during the update, the floppy
disk medium is damaged or the update file contains data which are not valid.
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