ER09 - Unable to download firmware due to lack of space on printer

This error can appear on your Ultimaker 3 or Ultimaker 3 Extended when the printer failed to successfully download the firmware update files.

First, restart the printer using the power switch at the back. It is recommended to keep it powered off for ~10 seconds before turning the machine on again. Ensure that the printer is connected to a stable network with internet access.

Try to install the firmware again.

If you see the same error message, perform a factory reset on your printer. In the Ultimaker 3 menu, go to System - Maintenance - Factory reset

You can also try installing the new firmware via USB. See this page for more information:

Update the Ultimaker 3 firmware

Note: If problems persist after taking the steps on this page, contact support or your local reseller. Ensure to include the error number and the log files of your printer.

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