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- Can't Downgrade firmware on HP Officejet 8600 Plus!!!

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08-07-2017 08:50 AM
Sabretooth, update and another problem.
Following your advice that 8600 did not have the FW issue, I bought an HP 951 Cyan (the cartridge for which there was the error message "missing or damaged cartridge"). Once I replaced it, the printer reported that Yellow cartridge is damaged. I bought the HP 951 Yellow and replaced that too. Now the message is "there is a problem with the printer or ink system. Turn the printer off...".
By removing individual cartridges I have traced the problem to Cyan (i.e. if I remove Cyan, the error message changes to "cartridge missing or damaged". If Cyan is inserted, regardless to the presence of other cartridges the error message is "there is a problem with the printer or ink system...").
Any recommendations?
What I have done: re-set the printer, re-seated the print head, soaked the print head in water.
Thanks
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