Problem booting after installing 17093 build

I was able to boot finally after using the Windows Media Creation Tool to create new Windows 10 install usb, going into the bios and selecting to boot from usb, boot from it, and selecting Repair Windows. After fussing around with various options to repair the startup (all of which gave me errors) I reset the machine, went back into the bios, and suddenly had a second Master Boot Record to select. Booting from it worked! Thinking everything was fixed, I rebooted... and ran into the issue again. So I repeated the process and this time when I successfully booted and logged in, I went into settings and rolled back to a previous version of windows. Now everything boots fine with no reboot loops.

This whole incident has made me switch to the slow ring.