Datamax ST-3210 Operator's Manual page 57

4. Following a successful download, the printer will perform a 'cold
reset.' The previous printer setup will not be affected unless
substantial firmware data structure changes have occurred. Print a
Database Configuration Label to verify your new firmware version.
Following an unsuccessful download, the FAULT Light will
illuminate then the printer will perform a 'warm reset' The original
firmware will remain operational. If the printer fails to reset, toggle the
power 'Off' and 'On.'
Try re-sending the file to the printer. If the failure continues,
check the following possible causes:
•
An invalid or corrupted file is being downloaded - Ensure the file
being downloaded is correct and applicable for your printer model.
•
Possible communications error - Check the cable connection
between the host and printer and ensure that a quality, shielded
cable is used.
•
Possible Flash memory problem - Call for service.
S-Class 49