Tuki try to pres "c" and hold it before you inserd battery and relese it only after connect to cable. At last you can try to use 2+5 buttons to connect, and after that try normal "c" method.
Okay, I'll try it right now and I'll let you know, OWIES.
Thanks for your time. Hope your solution works because I'm so frustrated because I'm so close to unlock my k800i.
You can't imagine how happy I would be :)