I want to use non HP carts because they are cheaper

[pobz]

After forced firmware updates of a perfectly working printer that I have been using non HP cartridges for years, it is now not working because of erroneous forced errors.  HP have trashed my printer.   

So, I would like HP to downgrade the firmware or give me a refund  - or we go to court over a printer.

[Dragon-Fur]

@pobz 

Welcome to the HP User Community.

Unfortunately - we cannot help - not by overriding the restriction and not with any claims you want to press.

What?

We are a user community of volunteers.

We do not speak for HP and we certainly do not speak for the HP legal department.

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If / When there is an additional response, a Community moderator / agent will post back on this thread before using other methods to contact you. 

For those reading, the question refers to the following limitation > Dynamic Security

References

HP Officejet Pro 7740 Firmware Update 

Description

This software tool will help you update your printer to the latest firmware. Please refer to Enhancement/Fixes for more detail about the firmware update.
Reminder: Dynamic security enabled printer. This Firmware includes dynamic security measures, which are used to block cartridges using a non-HP chip or modified or non-HP electronic circuitry. The printer is intended to work only with new or reused cartridges that have a new or reused HP chip or circuitry. Periodic firmware updates will maintain the effectiveness of the dynamic security measures and block cartridges that previously worked. More at: https://www.hp.com/learn/ds
Note: For printers manufactured prior to December 1, 2016 dynamic security will not be enabled by this firmware. Please note that HP cannot guarantee the quality or reliability of non-HP cartridges.

Document

HP Printers - Dynamic Security Enabled Printers 

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HP OfficeJet Pro 7740 Wide Format All-in-One Printer series 

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[Repairatrooper]

You can use 3rd party or refilled cartridges that meet a basic requirement of containing an HP chip.

Product disclaimer

This printer is intended to work only with cartridges that have a new or reused HP chip, and it uses dynamic security measures to block cartridges using a non-HP chip. Periodic firmware updates will maintain the effectiveness of these measures and block cartridges that previously worked. A reused HP chip enables the use of reused, remanufactured, and refilled cartridges. More at:

http://www.hp.com/learn/ds