Thank you for your reply. In your case we advise you to install openwrt firmware instead of using dd-wrt firmware.
For your router, you can download the firmware from here: http://downloads.openwrt.org/backfire/10.03.1/brcm-2.4/openwrt-wrt54g-squashfs.bin
Under the Administration tab of the dd-wrt firmware you can upload this file.
We are developing a script that will perform the configuration automatically, but if you can’t wait please perform the following steps manually:
Once you have successfully changed the firmware on your router, you can access the router by entering address 192.168.1.1 on the web address bar. Make sure to change the password on the router. There will be a red box displayed asking you to change the password and Save and Apply the changes.
You need to SSH to your router. You need to use a utility like PuTTY to SSH to the router (you can download PuTTY from here: http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html). In the Host Name (or IP address) field of PuTTY enter 192.168.1.1 to access the router.
Once you have connected to the router. Enter the password of your router. Once you have accessed your router, you need to copy/paste a special command to this prompt.
You can find the command if you open a new web browser window, navigate to hotspotsystem.com and log in to your hotspot account. Under Manage > Locations > (choose your location) at the very bottom of the page there is a section ROUTER SETUP COMMAND FOR THIS LOCATION. There is a wget command displayed in the window.
Before you copy/paste the command please change the value “&version=v24” to “&version=openwrt”. You can change this value from the command prompt of PuTTY once you have pasted the command.
Also, make sure your router is connected to the internet via cable before you execute the command by pressing ENTER in PuTTY. This is because the router has to communicate with our servers in order to complete the configuration.
That’s it, after executing the command, wait a few seconds and your router will be configured for the location you have chosen.
If you experience any further errors while using this firmware, please let us know in order to support you.