MAINTENANCE ERROR - WF-C5210

[ATHER AYUB 1]

I BOUGHT PRINTER KEY BEFORE 3 OR 4 MONTHS AND ITS WORK FINE
YESTERDAY WHEN I ON MY PRINTER THE PRINTER SHOW ERROR (PICTURE ATTACHED

[John_Admin 390]

ROLL BACK EPSON FIRMWARE 

THEN REPLACE MAINTENANCE CARTRIDGE BY NEW

THEN INSTALL CHIPLESS FIRMWARE BACK

[ATHER AYUB 1]

THANKS FOR YOUR EARLY REPLY.. 
MAINTENANCE CARTRIDGE = MAINTENANCE BOX ??
AFTER THAT CAN I BUY NEW KEY OR WORK WITH OLD KEY 

[John_Admin 390]

USE RECOVERY CODE