Welcome to the forum. Here is my recommended reading for you. I suggest opening a trouble ticket with ObiHai directly. This problem may be beyond the scope of this forum.
http://www.obitalk.com/forum/index.php?topic=6534.0I would try the following.
Manually download the firmware
http://fw.obihai.com/OBi-1-3-0-2824.fwTry to access the following menu by logging in to your Obi directly.
System Management
>>>>>>>>>>>>>>>>>Device Update
You could alternately try the following url replace 192.168.1.164 with your Obi ip address in case the menu was not available.
http://192.168.0.164//webupdateconfig.htmThen browse for where you saved the firmware and upgrade manually.
Pleasae do let us know if any of this helps.