Well, I have already reset sync and now being signed in I can't see my bookmarks, speed dials, passwords and etc. BTW, thanks for answer)))
May be you know hoe to contact with support team?

I have reinstalled Windows and have installed after that the latest version of Opera and after entering my Opera account it required to enter passphrase which I couldn't remember and following the instructions I reset my synchronization... How can I restore all my data now? :awww: