Can't update from 14.0 MP1 to MP2

I'm trying to update my 14.0 MP1 installation as usual, by running the downloaded installer. It asks if i want to update, asks if i want to do DB backup and then it starts updating. Last thing shown is that it is waiting for LiveUpdate. Then it throws a bunch of cmd windows and starts to roll back. And now i have unfunctional SEPM server. Where can i see why it fails to update. Is my install completely broken now and do i have to do clean install now?