Only the USA versions of the EPSON SC P-800, SC P-6000, SC P-7000, SC P-8000, and SC P-9000 prevent the use of 3rd party cartridges. The European and Asian models can be imported and used with 3rd party cartridges provided you use a step-up voltage transformer.
The USA models track chip IDs. I understand that there are at least 30 different chip IDs for each color position. An OEM cartridge user's chance of installing a duplicate set of chip IDs is less than one in a billion. A 3rd party cartridge users chance is 100%. The user can install 3rd party cartridges, but the first time the chip auto-resets, or is reset by resetter, the printer locks out the user from using 3rd party carts because that combo of chip IDs was previously used. This is a permanent lockout. Epson indicated during the release of these printers in the NA market that they were designed to only work with OEM carts. It says this clearly on their website and NA brochures.
There does not appear to be a way to produce a resetting scheme that incrementally also changes the chip ID. The OEM chips have a huge amount of extraneous code on them - and it will take many engineering man hours to find code which can be overwritten without causing the printer to reject it. So, do not expect a fix to this any time soon from 3rd party. Will be miraculous when it does occur though from what has been indicated to me.
HP recently locked their inkjet printers. HP consumers were really upset and they were able to force HP into issuing a firmware update to unlock their inkjet printers. HP now faces four separate class-action suits from consumers which may become consolidated into one. These suits allege HP violated consumer-protection laws and U.S. antitrust laws. This is a clear example of what happens when consumers help themselves.