I've sent you a private message with reset instructions, follow the reset instruction to perform a full reset and re-initialize the printer. In order to access your private messages, click the private message icon on the upper right corner of your HP community profile...
@i_Albi, Welcome to the HP Support Community! I’m here to help. I understand you are not able to use the printer due to this error. Let us perform a factory reset to resolve this issue. The reset instructions are specific for your printer and performing those steps ...
Thank you for posting on HP Support Community. Don't worry as I'll be glad to help, I understand you are not able to use the printer due to this - 8204904
I receive the same error message for my HP Office Jet Pro 8020 with flashing lights and no ability to stop. Thanks, - 8204904