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- HP Community
- Printers
- Printing Errors or Lights & Stuck Print Jobs
- HP-8600 plus Firmware Downgrade

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05-29-2014 01:14 PM
I just got an 8600 aka CM750A that is rejecting the ink cartridges I bought after the install cartridges got used up. It tells me to get the OEM ones over and over but I got a whole case of these LMI ones, which were much cheaper than OEM. Looks like my version of firmware from what i read is rejecting the cartridges.
The version I have CKP5CN1334ER apparently i need the CLP1CN1322CR in order to get these cartridges to work.
Is there a method to do a forced downgrade?
Heres where i found the info about the firmware conflict and my cartridges:
05-29-2014 01:48 PM - edited 05-29-2014 01:50 PM
The 1322C firmware is available from HP here for the Mac version, here for the Windows version.
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08-06-2017 12:36 AM
Bob, I have the same issue - FW upgrade rejecting the third party cartridges. The links you published are unfortunately dead; I can not find FW update from HP (as they published for 8610, 8620, etc.), could you please recommend a solution?
Printer: HP OfficeJet Pro 8600 Plus.
Thanks!