Before diving into the "how," it is essential to understand the "why." The BIOS is stored on a chip on the motherboard. When you press the power button, the BIOS wakes up, checks the hardware (POST - Power On Self Test), and then hands control over to Windows.
Would you like the for your specific L745 variant? If yes, please provide the full model number from the bottom sticker (e.g., PSK1LU-02L00X). Update Bios Toshiba Satellite L745
Select (usually under the Exit tab) to clear the CMOS and ensure the new version runs correctly. Save and Exit to boot into Windows. Before diving into the "how," it is essential
Turn the laptop over. Look for a sticker that says Do not rely on "L745" alone. You need something like: Before diving into the "how