This is incorrect. The unit has the same problem with 64bit WEP keys for some reason. Even though Windows takes 10 ASCII characters for a 64 bit WEP key, the 770 wants 5, and with a 128bit WEP key, which is 26 ASCII characters, the 770 wants 13?

It was reported in another thread that you must use HEX values in order to input the thread correctly. I have not had a chance to try this as I ended up setting up another router without WEP security (which is a Joke anyway).