Good day!

I tried to search thru google and on this forum but I cannot seem to find the right answer. Btw, my question is how to reformat my ASUS ROG GL551JW Notebook without removing the genuine Windows 10 (Originally WIndows 😎 as the OS. I was told that the product key for the OS is already in the BIOS. If so, do I have to use the Factory Reset option of Windows 10 (though this doesn't seem to be a clean reformat at all) or download the OS from Windows and it will automatically read the key from the BIOS?

PS. This is the first time I will reformat without a hard copy of Windows. Sorry if I am such a noob. 😞

Thank and regards!