how can i unlock k610?

You again..really simply man..... check the tutorials

yea it's me...and if were talking already what do you think is better....flash and than unlock the k610 only or update my k610 to w660 and than unlock it(because i know after updating k610 to w660 there are some bugs)?
i checked, and i didn't find any tutorials....

Applying patches for db2020 that is tut man

BTW it is better to flash it to w660 and there are no bugs if you put patch which fixes that bug

i already know how to apply patches.
so I'll look for the "patch which fixes that bug" in a w660 patches thread i guess.

No, it's "Patch that fixes the bug".
I don't believe that you searched right. There is a whole thread with a great tutorial which shows you how to flash K610 to W660 step by step without bugs. It's in the Firmware section too (note Firmare not just Customizing Firmware/UI).