I bought 4 brand new gwn7600 from Telephony Depot. They came with 22.214.171.124 firmware. Neither Grandstream techs nor I have not been able to get the units to upgrade from 126.96.36.199 to a higher/newer firmware. We have both tried using local machine and server tftp & http as well as grandstream remote servers for the update but it still does not work. It always report “Upgrade Failed”. When we use the CLI is says firmware not found but we verify and the firmware is exactly where it should be. We also have gwn7610 and have no issues with updating the firmware using the same servers (tftp & http).
Has anyone else had this problem? Any suggestion is appreciated. Thanks.