You cannot update blindly. First, you need to know what version is currently running on your D305.
. Avoid updating via Wi-Fi, as a connection drop can cause permanent damage. Backup Settings: Update Software in TENDA D305
In the address bar, type the default IP address: 192.168.1.1 (or re.tenda.cn ). You cannot update blindly
Here’s a regarding updating software on the TENDA D305 (a 300Mbps wireless ADSL2+ modem router): You cannot update blindly. First