To update your device to the latest firmware, you must first download our CodeLoader software and possess a RC4 CodeLoader cable or equivalent. This is REQUIRED to upload FirmwareFirmwareThe core of most electronic devices is a microprocessor -- a tiny computer. The software that runs on the microprocessor is called firmware.
Read more » to Series 3 devices.
Purchase a CodeLoader cable here

Refer to this page for step-by-step directions to updating your firmware for any RC4 device

If you prefer video tutorials, you can reference this link for a visual representation of the process. Although the device used as an example in the video is not W-DIM, the steps still apply.