I just went through about 12 hours of productivity lost over a bad FW update on the M607. In my case the printer gave an error message that said the firmware was lost, then rebooted and stayed "Initializing" for 2 days before I tried to reload the newest FW. When that failed, I assumed it was a bad formatter board and upgraded a second printer so I could test its formatter. That bad FW crashed the other printer as well, so I now have 2 M607's w/bad FW.

Well, I located an older firmware version - 2 versions back - and downgraded to that version and both printers are working again.

Did you locate the older firmware on the HP site or somewhere else?

Thanks

HP's FTP site. I took the firmware download link and modified it with the version info as such:

(this is only for the M607 version)

Current FW from support.hp.com:

https://ftp.hp.com/pub/softlib/software13/printers/LJM607_608_609/ljM607_608_609_fs4.10.0.1_fw_24100...

From the current FW's Release Notes, I located the necessary info from the earlier release, then modified the link as such:

https://ftp.hp.com/pub/softlib/software13/printers/LJM607_608_609/ljM607_608_609_fs4.9.0.2_fw_240906... where "fs" = FutureSmart release version, "fw_" = firmware revision number.

The Release Notes should have the following table for every version to obtain the info you need:

Current firmware revisions included in this firmware bundle:
DEVICE FIRMWARE REVISION

COMPONENT FIRMWARE VERSION HP LASERJET M607, M608, M609 SERIES Firmware Datecode: 20191116
Firmware Revision: 2409065_000063 Embedded JetDirect: JSI24090014 DC Controller Version 4.133 Optional Trays Version 4.108 HP Fleet Release Designation Original Release FutureSmart 4.9.0.2 MD5 checksum for .bdl file 6ff3573e6a364182134e79b4baf484ac

When I modified the link, it downloaded the older FW with no problem and I saved it to a USB drive. When I went into the pre-boot menu to upload the firmware, the printer showed on the display: "You are about to downgrade the firmware and rollback to an earlier version. You will lose all settings and customizations."

When it completed, it went through the whole new printer setup process, but everything worked after that.

I haven't been able to find earlier firmware at HP and the HP chat person said it's not possible so I'll probably try to sell the printer to a Windows user and buy another printer. (not an HP)

Thanks for your help anyway

hold up - try these links:

https://ftp.hp.com/pub/softlib/software12/ready2dl/HP_LaserJet_M402_M403_Series_FW_20190113.ENG.rfu 

that's the previous FW, but it needs the update utility.  (Maybe you can do it from the pre-boot menu?)

Here's the original FW it came with:

https://ftp.hp.com/pub/softlib/software13/COL64040/lj-162234-1/M402_M403_Series_FW_Update-20150916.e... 

still looking for others...

You may be able to apply the 2015 FW, then upgrade to the earlier 2019-01-13 FW.

Here is another searchable repository from HP:

ftp://ftp.hp.com/pub/networking/software/pfirmware/

I didn't see that you were working with Linux before now, so here's another resource for you:

https:// itinquisition. blogspot. com/2019/07/firmly-firmware-aware.html

(sorry for the spaces, the forum requires them for any blogspot links, but if you parse them out you can get to that page.)

He specifically has some M402 examples and updating under Wine: