Lexmark 66S1H00 NEW COMPATIBLE Toner High Yield - Black

For Use In: MS531dw, MX532adwe

Yield : 28,400 Pages OEM# (Alias) 66S1H00, 661H

NOT MADE BY LEXMARK

ATTENTION: We recommend customers not to upgrade their printer firmware. These Lexmark printers does not automatically upgrade the firmware through Wi-Fi, users will be prompted to manually do the firmware upgrade. If users receive this message to "upgrade", do not choose it. will work only on printers with firmware listed below :

do not buy if the firmware is later than July 15 2026.

Firmware Version – 250.257 Date Release – July 15, 2026

no returns on this item due to firmware upgrade issues.