Thank you for your reply, I'll be more than glad to help you.
I understand that the issue still persists as the numbers from the junk fax list cannot be deleted.
Please follow the step by step guide to reset the printer:
1.Turn the printer on, if it is not already on.
2.Wait until the printer is idle and silent before you continue.
3.With the printer turned on, disconnect the power cord from the rear of the printer.
4.Unplug the power cord from the wall outlet.
5.Wait at least 60 seconds.
6.Plug the power cord back into the wall outlet.
NOTE: HP recommends connecting the printer power cord directly to the wall outlet.
7.Reconnect the power cord to the rear of the printer.
8.Turn on the printer, if it does not automatically turn on. The printer might go through a warm-up period. The printer lights might flash, and the carriage might move.
9.Wait until the warm-up period finishes and your printer is idle and silent before you proceed.
If the issue still persists, then you may need to contact HP phone support for further assistance at the link: www.hp.com/contacthp