Hello. I have ASUS X200M notebook that came with Win 8.1 SL OEM x64 Already activated online I Checked the OEM : DM key is there on the MSDM ACPI I want to downgrade to win 7 pro/ult, add SLIC 2.1 to BIOS, and upgrade to win 10 pro Since Win 8.1 SL only get upgrade to Win 10 Home But I don't want to lose my Win 8.1 SL DM key and certificate on the BIOS So I can use anytime my genuine Win 8.1 SL OEM My questions : 1. Can we add SLIC 2.1 to the BIOS without losing my Win 8.1 SL DM key and certificate on my BIOS? 2. I already found this : http://forums.mydigitallife.net/thr...s-mod-requests?p=997313&viewfull=1#post997313 and then this http://forums.mydigitallife.net/thr...uests/page1869?p=950332&viewfull=1#post950332 Please explain me what is "Universal" means? 3. For example, if I download the newest BIOS from ASUS and flashed it, will I lose my Win 8.1 SL DM key + certificate? I'm so confused about Win 8.1 SLIC A little help please Thank you. Raditz.