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05-25-2020 05:07 AM
Hi there! Just upgraded Hp designjet 500 plus firmware after error code 79:04. Used the firmware upgrade tool for windows and, after installing, the printer is no longer recognised via USB with the "Unknown device connected" message apearing every time.
Does anybody know how to fix this?
05-25-2020 01:56 PM
Can you access to the FP?
if yes : perform EEROM Setup then install the firmware following below article :
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