Ok, I flashed it back to k530 and it works normally (it's coded to T-Mobile and I used patch for another network(Tele2)).
I think I know what the problem is: custom pack I use 'cause now I used T-Mobile custompack and it worked normally.
So, does anyone have custompack for unlocking T-Mobile on w660, CID 52 db2020 R8BB001?
(it's locked to T-Mobile)