For my link archive, to get firmware updates installed on my OKI MC342 printer (Mac update fails, Windows update fails, both with “Firmware update failed.”):
download support printer drivers and software utilities for your OKI printers
Source: MC342dn | Drivers & software | OKI UK | Printers & Managed Print Services
[Oki Data] The Firmware Update Utility is used to upload new firmware files to your printer.
Source: Firmware Update | OKI Global
I needed a firmware update because enabling Google Cloud Printing failed.
Source: Cloud Printing | OKI Europe Ltd – Printers, Printing Solutions and Managed Print Services
The reason was error 10a00013 which according to the Cloud Print Manual is “Connection error to the HTTP server (server authentication error). Access the website stored in the Oki Data device (http://(Oki Data device IP address)), and check the imported CA license. Alternatively, update the firmware.”
As the web page didn’t tell me about how to imported CA licenses, I have to update the firmware.
–jeroen