Yes. It seems Dell has removed all older versions of Bios except A10 on official support site. For each version in its details Dell includes fix detail. A11 Fixes:- Firmware updates to address security advisories INTEL-SA-00233(CVE-2018-12126, CVE-2018-12127, CVE-2018-12130 and CVE-2019-11091) A10:- Updated to the CPU microcode to address security advisory INTEL-SA-00115 (CVE-2018-3639 and CVE-2018-3640). Use google to find older bios version  A03:   
I have a Dell XPS18 that was passed on to me...and the bios has never been updated. Current BIOS is at A00. Most current BIOS on the Dell web site is A11. Am running the most recent upgrade of Windows 10 Pro. I was suspicious when I ran the Dell Tune Up Utility which was going to upgrade the bios to A03. Should I use the Tune Up utility and upgrade to A03 just go to A11 directly? The last experience I had with a BIOS update did not go well. What is the safest way to do this update?   Thanks, Tom
Update XPS18 1820 BIOS from A00 to A11? or to A03 as suggested by Dell Tune Up?