Showing results for 
Search instead for 
Did you mean: 
New member
4 2 0 0
Flag Post
HP Recommended

OfficeJet 8600 Printhead error after firmware update

Accepted the firmware update this morning and was then greeted by "The printhead appears to be missing, not detected, or incorrectly installed."  Tried all the troubleshooting steps: reset printer (unplug while on, wait 60 sec), cleaned and reseated printhead.  Reseated cartridges.  Repeated many times.   

Could be a true printhead failure, I suppose, but the coincidence is striking.   


Used as wifi printer only.


HP Officejet Pro 8600 N911g

Model Number CM750A        

Firmware Version CKP5CN1829AR


Can I downgrade the firmware somehow?



former hp employee

The following has evaluated to null or missing: ==> page.context.thread [in template "gz-hp.custom.reply.metoo" at line 4, column 22] ---- Tip: It's the step after the last dot that caused this error, not those before it. ---- Tip: If the failing expression is known to be legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (!myDefault, ( ---- ---- FTL stack trace ("~" means nesting-related): - Failed at: #assign threadId = page.context.threa... [in template "gz-hp.custom.reply.metoo" at line 4, column 1] ----
Tags (2)
Who Me Too'd this topic
† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the Terms of Use and Rules of Participation