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HP Officejet Pro 8600 e-All-in-One Printer - N911a
Microsoft Windows 10 (64-bit)

I get an error message that the HP 950xl is not supported on this printer.  When I checked further it says that this new HP 950xl is a z20 and I need only a z10.  nothing on the printer cartridge says that it is a z20. 

I have tried all the solutions on the HP site.  I have the latest updates to the firmware and the software.  I read that HP's firmware does not allow unsupported non HP cartridges to be installed.  My cartridge is a genuine HP cartridge.  Can I downgrade my firmware so it will accept this cartridge?  I went back to the store that sells the cartridges and they said it is my problem to fix it since these are the only HP950xl that they sell.

 

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