Chapter 2 of the z170 pro manual goes into great detail about how to flash the bios for your motherboard. The manual can be downloaded here if you would like to see it for reference:
LINK
2.1.2
ASUS EZ Flash 3
The ASUS EZ Flash 3 feature allows you to update the BIOS without using an OS‑based utility.
• Ensure that you load the BIOS default settings to ensure system compatibility and stability. Select the Load Optimized Defaultsitem under the Exit menu. See section 2.10 Exit Menu for details.
• Check your Internet connection before updating the BIOS via the Internet.
To update the BIOS using EZ Flash 3:
1. Enter the Advanced Mode of the BIOS setup program. Go to the Toolmenu to select ASUS EZ Flash 3 Utility and press <Enter> to enable it.
2. Follow the steps below to update the BIOS via USB or Internet.
Via USB
a) Insert the USB flash disk that contains the latest BIOS file to the USB port, then select by USB.
b) Press <Tab> to switch to the Drive field.
c) Press the Up/Down arrow keys to find the USB flash disk that contains the latest BIOS, and then press <Enter>.
d) Press <Tab> to switch to the Folder Info field.
e) Press the Up/Down arrow keys to find the BIOS file, and then press <Enter> to perform the BIOS update process.
Via the Internet
a) Select by Internet.
b) Press the Left/Right arrow keys to select an Internet connection method, and then press <Enter>.
c) Follow the onscreen instructions to complete the update.
3. Reboot the system when the update process is done.
**ASUS EZ Flash 3 supports USB devices, such as a USB flash disk, with FAT 32/16
format and single partition only.
**DO NOT shut down or reset the system while updating the BIOS to prevent system
boot failure
Other flash options and important reminders (like making sure the USB is in FAT and not NTFS) are also in that chapter. Before actually flashing the BIOS I strongly recommend reading the entirety of chapter 2 to get your bearings on the process.
This process can seem daunting if you haven't done it before, but just be sure to follow all the steps carefully and it isn't bad at all. Please let us know how the flash turns out!
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