my x51v worked well with BT activesyn before. But today I was working on sharing folder and changed the device name for my x51v. Then

my x51v can't activesyn with BT. When I deleted the bluetooth partnership and tried to add a new partnership, it can't find my desktop.

whey i was trying to find my x51v from desktop BT manager, it can't either....
Anybody knows why this happend? I'm so fucked....