HP Color LaserJet MFP M477 no longer sleeps after update

[mk553]

After allowing my HP Color LaserJet MFP M477fdn to upgrade its software to 20190712, it no longer powers down on its own/goes to sleep. In fact, after 15 minutes, it reactivates and warms itself back up. The LCD screen now stays on indefinitely.

I've tried manually changing its inactivity time from 15 to 5 minutes. 

At this point, I'd like to downgrade the firmware to whatever it originally had when I bought it a year or two ago. It was flawless.

As far as I can tell, the HP product support page no longer has an option prior to this 20190712 update.

Can someone help? 

Thanks.

[ALS-77 · Accepted solution]

There was someone else recently that had a similar problem where their printer would wake up after it went to sleep. Turned out it was an issue with the fax option/card. Here's a link to the post:

https://h30434.www3.hp.com/t5/LaserJet-Printing/MFP-M477fdw-wakes-up-immediately-after-going-to-slee...

[mk553]

Thanks, disabling the fax appears to solve the problem for me as well.

Now, I just need to decide if I want to replace the fax card.

[ALS-77]

Excellent! Glad to hear that that fixed your issue as well.

[mk553]

To follow-up, I replaced the Fax Card, but still the same problem. I wonder if it's still possible to roll back the firmware? 

[ALS-77]

Yes, if you can find on older version.