I left it without battery for few hours and put a formatted card with RC3 firmware. After I plugged it to wall charger (without battery), I managed to reset it, it detected new firmware and started installing. At one moment the led started flashing from blue to red, then it became green for a while and then became stuck in blue/red, as in video below. What is not noticeable in the video below is that the boot animation became darker than usual and that the loading animation was still on:
Here are some pictures of how it looked after crash and after first failed reboot: