HP PageWide 377dw Multifunction Printer : hangs as soon as it has started up,

[dppwright]

Suspect it just needs factory reset and/or the Super NVRAM resetting. 

Touchscreen inoperative once it has crashed, so can't do anything through there.

I understand there is a "secret" startup sequence to do an NVRAM reset - so what is that for this MFP, which ONLY has a touchscreen (no manual keys)?

Note, touchscreen operative until printer hangs.

Many thanks in anticipation

[vraps · Accepted solution]

I'm also having a similar issue and contacting support, this is how you do a hard reset:

1, With the printer unplugged from power source, press and hold the power button while re-plugging the power cord, continuing to press the power button. After about 15 seconds the Home and Back buttons will light up.

2. Release the power button. Touch Home, Back, Home, Home in that order.

3. When the blue screen appears on the control panel, wait 5 seconds and then touch the Menu button in the lower right corner of the screen. NOTE: Do NOT select the Reflash option on this screen.

4. After touching the Menu button, Then in the blue screen press next until you see Full Reset and then press OK.

The Hard reset would complete.

[dppwright]

Many thanks, Vraps. That solved the issue on how to do a factory reset.

Sadly that didn't resolve my issue. I've narrowed it down now though. Printer will come up, and all is good.  As soon as I plug it inot the network, or enable WiFi, it hangs. Touchscreen dead, and printer not visible on the network. Can talk to it through USB, but why it suddenly no longer works on a network, and crashes is puzzling. Anyone any ideas?

[Repairatrooper]

You need to downgrade your firmware to the previous release. I have posted those instructions in several threads that you can find. 

These are the instructions:

Based on what I am seeing on these boards here are some steps to try:

1. Turn off wireless and disconnect any ethernet cable from the printer. In some cases you may need to temporarily disable your wireless router to test this.

2. Power the unit on. Many posts here state that they were able to get the printer to ready with networking disconnected. If the printer comes to ready then you will likely be able to resolve this.

3. download the firmware update utility for your printer from support.hp.com. Version needs to be 2313A or older

4. Using a program called 7-Zip, extract the .ful2 file from the file you downloaded and copy to a USB Pen drive.

5. Insert that pen drive into the USB slot by the control panel. A USB icon should appear on the control panel. Touch it and there should be an option "upgrade detected". It can take up to ten minutes for the printer to realize the upgrade is there so be patient. Once you see the icon,  touch it and the firmware downgrade will be applied. 

6. When unit starts back up, turn off automatic updates so the problem firmware is not reapplied.

[dppwright]

Perfect - di exactly as you said, and printer now up and running again on the network. Many, many thanks,

[TW2204]

I cannot thank you enough.
A perfect step-by-step guide that worked flawlessly.
I have made an account just to say 'thank you'

[dppwright]

To be fair, it was Repairatropper above who provided the solution!

[Kanoj]

In my case, when I try to do the downgrade using the "cold boot while pressing power button" option, printer gets stuck on "verifying" firmware, even for hours. I have tried different firmware versions with no luck. Any ideas?