epson dx7400 cartridge incompat errors

  peterpurr 15:40 15 Mar 2018
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I have an epson dx7400 it fails with cartridge incompat errors i have changed numerous campat cartridges without resolving. I tried the power cycle method that did not work, do i have to purchase genuine epson cartridges or is there a workaround i can use. some talk of firmware downgrade, any advice and how

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