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Troubleshooting
USB Host
1/13/2016 ZD420 User’s Guide 212485-001 Rev. A
Flash Drive Preparation and Firmware Update
1. On your USB Flash Drive, create the following:
• a folder called Zebra
• in that folder, create three sub-directories:
•appl
• commands
•files
2. In the /appl folder, place a copy of the latest firmware for your printer.
3. Load the printer with media. See Loading Roll Media on page 32.
4. Insert the USB Flash drive into the USB host port on your printer.
5. Observe the control panel and wait.
If the firmware version on the USB Flash drive is different than the version installed on the
printer, the firmware will download to the printer. The data indicator will flash green while the
firmware is downloading. The printer will restart with all indicators flashing. When the
firmware update has completed, the
STATUS indicator ( ) will display solid Green as the
firmware is validated and installed. A printer Configuration Report is automatically printed and
the firmware update has been completed.
6. Remove the USB Flash drive from the printer.
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