I've tried, but haven't been able to crack the V3 password yet. The password on the V3 is more complicated than on the EnTama and UraTama.
Once the v4 becomes more worldwide, would you do a similar thing with that?
I don't have a V4 to try yet, but if I can crack the password I'll do something with it. I expect the password on the V4 will be similar to the V3's, so I may have trouble with it. Actually, from what I've seen, there are two passwords: the login/logout password for Gotchi Points, and the password for items/souvenirs.
I'm also looking to get the current Japanese Tamagotchi model ("Tama School") maybe in January, and having a go at their passwords too. Hopefully, their passwords will be similar to the EnTama and UraTama's, in which case I should be able to crack them.