I managed to compile OpenWrt with working DDServer package for the HT-TM05.
You can get the *sysupgrade.bin here
I used the following instructions for the upgrade, but be aware that I don't know any solution to return to the oem firmware.
- Install OpenWrt firmware as described in the OpenWrt-Wiki
- Connect the HT-TM05 to your PC via Ethernet and set your IP address to dynamic or 192.168.1.X
- Open the Web-Interface of the HT-TM05 in your browser. URL is 192.168.1.1
- Go to [System] -> [Backup / Flash Firmware] and flash the above provided *sysupgrade.bin as new firmware.
- Hostname is set to "DDServer"
- HT-TM05 works as a bridged access point
- WLAN-AP with static IP 192.168.4.1
- WLAN SSID set to "DDServer"
- WLAN-Password set to "DDServer-Wifi"
- DHCP-Server for the wireless interface is turned on
- LAN-Interface is set to "DHCP-Client"
- Firewall is configured to allow sharing of the Internet-Connection between LAN-Interface and WLAN-Clients