I got it back now, and was told they had done their best. Yet when I checked it, I found that they had SOMEHOW managed to downgrade it back to CID52! They must have had one of those expensive boxes to do it. But for some reason it was locked to O2, as any other sim I had said "insert correct sim". Well, fair enough I AM on 02, but what if someone else borrows my phone and needs to use their own non-02 sim? So, I thought what the hell, upgrade it to k810i, this time using k810 cid52 flash files and NOT SE update! Applied the unlock patch via setool and... everything's back to normal. Now I just need to remember not to ever use SE update, and if I ever reflash, use CID52 files and re-unlock it via patch...