you already have Dell 2.4 SLIC in bios, so install Win7, then install Dell Cert. & proper OEM:SLP Win7 key
tools with Dell 2.2 SLIC for MSI X99 series mobo - https://forums.mydigitallife.net/th...requests-post-here.5865/page-372#post-1384435
Post https://forums.mydigitallife.net/threads/award-ami-bios-mod-requests.5863/page-2677#post-949685 updated