everything worked fine until remountrebootfix installation, where the process got stuck at "Waiting for Device, connect USB cable now."
If you're like me and took a slightly different approach than this post (i.e. unlocked your bootloader, got stuck in bootloop, then flashed firmware anew, before starting towelroot and etc.) you might think you've installed all possible USB drivers on your (windows 8) PC as many times as possible, but in fact you haven't. So get into your Device Manager and install the android_winusb again.
that ought to fix it.