I am aware of all the sources stating that UEFI replaces BIOS. And i'm aware that UEFI includes legacy mode. But this question is not about UEFI legacy mode. "A common misconception is that UEFI is a ...

A computer’s basic input/output system (BIOS) is a program that’s stored in nonvolatile memory such as read-only memory (ROM) or flash memory, making it firmware. The BIOS (sometimes called ROM BIOS) ...

The first easy step is to reset the CMOS and see if it helps you boot into Windows. To reset or clear CMOS, follow these steps: Force shut down your computer by pressing and holding the power button.