Why does everyone think the *#*#682#*#* code doesn't work? I did it about 10 minutes ago, working fine. Make sure you're only Wifi. It gave no indication of working with wifi off, but when I connected to wifi and tried again it started within ~15 seconds.
I kept trying and after entering the code it would just disappear and I tried on wi-fi and connected to a charger and it never came up offering to download.