I too am a victim of the Epson Printer firmware which prevents the use of any but Epson print cartridges. This just happened 6-18-2018 regarding an Epson XP-830 purchased this past February.
Apparently there is no fix and the problem is VERY widespread among Epson Printer owners.
This practice is most certainly a scam. There was no problem until Epson sent out their update firmware nor were there any restrictions on which cartridges I use at the time of purchase. This is akin to buying a new car and only being able to use one brand of gasoline. I would wonder if it's even no illegal.
What puzzles me is that if this is so widespread and obviously such a dodgy effort, why has there been no class-action lawsuit filed against Epson.
Perhaps there has been and I'm unaware of that. If so, I'd appreciate the information.