I updated the Epson printer on my iMac OS X Yosemite 10.10.1 and my generic ink cartridge does not work.

On my iMac OS X Yosemite 10.10.1 I updated for my Epson Stylus NX420 and my generic ink cartridges no longer work.  Can I delete the update?

Can I delete the update?
You might be able to revert back to the drivers you have before you upgraded if you have a backup of your hard drive made just prior to the update.  But I'd try the Reset Printing System first.
If you do have a suitable backup go to the HD/LIbrary/Printers folder
and copy the EPSON folder to your Desktop.
Find the same folder on your boot drive and replace it with the one from the backup.
Also go to the backup's Users/Home/Library/Printers folder and copy the Epson app for your printer to the same folder on the boot drive.
I have an Epson R280 printer.
Finally reboot, repair disk permissions and try again.
The above is what I had to do when I upgraded to Yosemite.

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