!
error HP
Error Code E9
Firmware update error. The printer firmware update has failed.
? What Causes This
Interrupted firmware update or corrupted update file.
✓ How to Fix It
Turn the printer off, and then on again. If the problem persists, contact HP.
Source: page 15 of the official manual
From the manual
This error code appears in:
HP Smart Tank 6000 Printer