WF4734 firmware update problem

Oct 17, 2019
After applying the current firmware update (CM27J9) to my WF4734 printer it has ceased to function, reporting "Cannot recognize ink cartridge Try installing again" For months prior I have used an aftermarket ink cartridge with no problems. Epson has apparently ignored Supreme Court decision 15-1189 (Impression Products v. Lexmark) of May 30, 2017 in making the decision to block usage of aftermarket ink cartridges. I am unable to locate the prior firmware version to download and reinstall (and of course will never do a firmware update or purchase an Epson product again). Short of attempting to instigate a class action lawsuit, what recourse do I have?

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