I always use Internet Explorer when configuring my 2820. Firefox tends to try and pre-fill the wrong things, and then when you save config, you end up with a screwed up configuration, or, a configuration which you did not expect.

Certainly a good tip

I find a few things won't stick (2820Vn) - a phonebook edit recently and an attempt at call barring. I'm not using IE for anyone - telnet (and/or ssh) does the job ok. That was on 3.3.3 firmware which I may yet return to from 3.3.5.2.

I'm finding that configuring a 2800 from IE9 requires compatibility mode or fields get the wrong values.

Anyone know if Chrome is okay?
I thinking about getting a 2710Vn and I only use Chrome at the moment on both Windows and Linux.