Please take a look at our online instructions articles. We tend to update these frequently.https://cisinks.freshdesk.com/support/solutions/articles/5000697074-t252-epson-wf-3620-wf-3640-wf-7610-wf-7620-wf-7110-wf-2630-wf-2640-wf-2650-wf-2660-not-recognizing-c
This article here addresses the issue for non-recognition for all four colors on the printer. You will need to hard reset the printer as instructed in this guide.
You need to do the hard reset with the battery wire connected to the chip and once without the wire connected to the chip. Depending on your printer's firmware , it may read them with this battery wire installed or without. Try both methods with the hard reset and it will read .
This will show how to prime the cartridges , this video here shows how to prime from the bottom:https://www.youtube.com/watch?v=McHXJea9Xts
This video here shows how to prime from the top :https://www.youtube.com/watch?v=kIq1QBWOkuw
IF you still are having issues, please contact me for further instructions.