For about 2 weeks it had been telling me that there's new update available (4.4.3., I think), but I've downloaded and installed several times. After every reboot (after downloading and installing update) the notification about it popped up again. So the last time I did it, I plugged in the cable during the update (even though the power was at 82%) and when I came back, the phone was bricked. I could only start it if it was powered by a cable and after the "Google with the padlock at the bottom" screen it went dark again. Same thing with Recovery boot. I thought I would need to factory reset, but then I tried pulling the battery out and plugging it back in and the device is fine.
I have a rooted 32GB, bootloader version HHZ11k. Any idea what might have caused this issue and how to avoid it in the future?