Brother recently upgraded their printer hardware to block the compatible cartridge, to know how to identify the manufactured date using the Brother's serial number can help you to make a decision to purchase a  compatible cartridge or OEM product.   

The following is a guide for interpreting the serial number of the Brother's printer.

The seventh alpha character of the serial number indicates the month of production and the eighth digit of the serial number indicates the year of production.

Example: E79418A9H387936 , according for this serial number, the manufactured date for this printer is on January 2019. 

A = Jan.   B = Feb.  C = Mar.  D = Apr.  E = May.  F = Jun.  G = Jul.  H = Aug.  J = Sep.  K = Oct.  L = Nov.  M = Dec.

7 = 2017   8 = 2018   9 = 2019