sidenote: are you trying to change it with say a laptop connected to the network via wireless? 'cause that won't work, it will reset to some default chinese based pools every time. you need to connect with something via ethernet cable. it has some built in air-gap sort of thing based on wincpap. I'm guessing this was the solution to not letting people change the web admin password?  who knows what they were thinking there.
plug a cat5 into your laptop going to the same router as the ebit and voila you can change pools etc.. no problem.