mobile

12S came out today, and since this phone isn't my daily driver right now, I figured I would fastboot 11S back on my phone, then put TWRP on it so I can flash the update from scratch etc, and about half way through installing 11S through fastboot, the screen turns off and won't turn back on. I was at more than 50% when I was flashing 11S. I have been doing this stuff for a while with a bunch of different phones. I know it's not something I did. I tried hard rebooting on and off of the charger, trying it regularly on and off the charger. I have no idea why it won't power on. Anyone experience this and know how to fix it?