im literally losing my mind here my home-built PC wont boot after a firmware update.

Reboot and Select proper Boot device
or Insert Boot Media in selected Boot device and press a key
No bootable device -- insert boot disk and press any key
the update was going fine until the screen stayed black... i waited a long time before touching anything, then finally turned it off, now it powers on but shows nothing, i've read about BIOS recovery features but i don't know whether my machine has them.. 🙏 help me figure out my options before i start pricing new motherboards.
the real fix was the friends we made along the way