Driver for OKI ML421-Black
Table of Contents

The official driver for the OKI ML421-Black printer is essential for the first connection of the device to your computer and for reinstalling the Windows operating system. This driver allows your system to recognize the printer for setup and printing purposes. The installation process is automatic and should be trouble-free; however, a restart of your computer is necessary to apply the changes after installation.
You can download the driver for the OKI ML421-Black that suits your operating system version from the table below, and we recommend reviewing the installation instructions afterward.
Download Driver for OKI ML421-Black
Supported OS: Windows 11, Windows 10 32-bit, Windows 10 64-bit, Windows 8.1 32-bit, Windows 8.1 64-bit, Windows 8 32-bit, Windows 8 64-bit, Windows 7 32-bit, Windows 7 64-bit | |
Driver Type | Download |
Universal PCL5 Printer Driver |
On this page, you can download the driver for OKI ML421-Black! Download the required drivers for your operating system for free: Windows, Linux, Mac.

How to Install the Driver for OKI ML421-Black
- Download the driver matching your version of Windows from the table.
- Run the downloaded file.
- Accept the “License Agreement” and click “Next.”
- Choose the connection method for the printer and click “Next.”
- Wait for the installation to complete.
- Restart your computer to apply the changes.


Before installing the driver, ensure that no other version is installed on your computer. If it is, please uninstall it before installing the new version.
Common Errors and Solutions During Driver Installation
- Printer detection issue: If the device is not found, it is advisable to download a different version of the driver.
- Printing problems: If the printer does not print after installing the driver, ensure that you have restarted your computer.
- Unable to open the driver file: If the file does not open, check your system for viruses, then restart and try again.