You can download updates of the Sun Rack II PDU monitoring firmware at:
For the original PDU, if the download is not a single ZIP file, ensure that you download both the metering unit firmware (MKAPP_V1.x.dl) and the HTML interface files (HTML_V1.x.x.dl) from the web site.
For the enhanced PDU, if the download is not a single ZIP file, ensure that you download the metering unit firmware (MKAPP_Vx.x.dl) from the web site.
Refer to the Sun Rack II Power Distribution Unit User's Guide, and any text file included with the firmware, for instructions on how to update the firmware.