Appendix B: Updating firmware in boot mode
If the printer is displaying a 79:04 system error during start up and will not start normally, then services like
the Embedded Web Server will not work.
If it is not possible to perform a firmware upgrade using the normal procedures (for instance, if there is a
System Error and the Embedded Web Server is unavailable), it is possible to perform an emergency firmware
upgrade using a USB flash drive. Follow these steps:
1. Copy a valid FMW firmware file onto a USB flash drive. This file is provided in HP Designjet Online.
Remove all other contents from the flash drive.
2. Turn off the product.
3. Connect the USB flash drive to the USB host port in the front panel.
4. Turn on the product, and follow the front panel instructions.
ENWW Appendix B: Updating firmware in boot mode 155
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