I contacted Brother using Chat in Thailand. I was connected to Nong Care, who emailed two files.
https://www.brother.co.th/th-th.
Here is the text in the email:
"As our previous conversation over chat channel, kindly use “Brother_PrinterDrivers_Inkjet19.7z” to install the driver from attachment and read the document of how to install this driver from attached file as well.
NOTE: Model DCP-T420W does not have the full driver for Mac users because the model does not support Airprint, or does not have the Airprint to work with macOS.
AirPrint is a feature in Apple without the need to download or install drivers.
Therefore, we create the Adhoc driver for the customers who do not know that the printer does not support Airprint.
Please use the driver provided in attached file and follow the instructions provided below and how to add printer driver in the attachment after installing the driver completely.
Instructions (Please read and follow carefully)
- Please save as "Brother_PrinterDrivers_Inkjet19.7z" file on your computer and extract the file.
- Install Driver Utilities and follow the steps or instructions of how to install the driver from attached file. (Easy steps to follow)"
I installed the CUPS drive and the printer now prints perfectly. No need to use the limited iPrint&Scan either!
How can I share the files?