To update your Grandstream firmware, please visit http://www.grandstream.com/support/firmware    Unzip the firmware file and put all of them under the root directory of TFTP server. If you do not have one, you can download the free windows version TFTP server here: http://www.solarwinds.com/downloads/   Change the TFTP server’s default setting from “Receive Only” to “Transmit Only”. Put the computer and Grandstream products in the same LAN segment to do upgrading.