I actually just got into BIOS screen by restarting my PC and pressing F2. Anything I can do from there?
As we said in the very beginning of this thread, the settings you changed in windows have nothing to do with bios.
You cant fix your wrong windows settings in bios.
You need to boot into windows either in normal mode or safe mode from your motherboard graphics ports.
Once in windows you can re-enable your GPU. Then you can reboot and use GPU again.
You can try to remove GPU, then boot into windows using motherboard ports, go into device manager and show hidden(under view menu) hardware and see if it shows your GPU that you manually disabled, enable it, then shut down, reinstall GPU and try to boot windows back up.