What motherboard BIOS version is currently installed?
Which M.2 slot are you using, the one through the CPU or the motherboard chipset?
Have you tried reinstalling the M.2 drive just to be sure it is fully seated, even if it shows up in the BIOS I'd still try to reseat it, just to be sure. And, I'd be sure that it is installed in the M.2_1 slot. If it IS in that slot, then try the other slot.
Do you have ANY other drives attached to the system? I'm assuming not since Windows is telling you there are no drives available, but always worth asking when an M.2 drive isn't showing up.
What "suggestions" have you tried? It's always a good idea to include anything you've "already tried" so we know what's been done or not done.
Is secure boot and all UEFI options enabled in the BIOS including AHCI mode?
Thank you for your time replying to my question.
I'm using the version 1402 bios, I believe its the latest version available on Asus website.
As for slot currenly I'm using the one through CPU (the slot right above the GPU), although I've yet to try the other slot so Im going to try that.
I did try reinstalling it but on the same slot, so I will try the other slot.
I dont have any other drive , Its just my M.2 SSD since a friend told me not to plug other drive until I install windows.
I've updated my bios, I did the shift+F10 command prompt to clean disk (but it didn't read my M.2 SSD, only my bootable flashdisk), disabling CMS and changing boot settings.
I couldn't found the AHCI setting in my bios, I don't know is that mean I don't have the latest bios update or something, but I couldn't find it anywhere not even with the F9 Search option.
I cant really fiddle around with the bios settings since I dont really understand much bcs honestly this is my first time building my own PC.
Again thank you for trying to help