[NAME]  I haven't installed KB5010793. It's OK to skip BIOS 1.1.19. Updates are cumulative so 1.1.20 should have everything that was originally fixed 1.1.19. BIOS 0.1.1.19 is still listed as "optional" by Windows Update for my PC, but the last time I ignored an "optional" BIOS update for a couple of weeks, WU forcibly installed it. I suggest you try this for the rebooting issue: Let us know if that solves this problem...
Dell has released BIOS 1.1.20 for the XPS 8930 to fix some security issues. After you install this update, be sure to go into BIOS setup and confirm that the settings for UEFI Capsule Updates, Automatic BIOS Recovery, Integrity Check, Wake by LAN, etc, are set the way you want. If you changed any of those from their default settings, the update will revert them back to their defaults. Also be aware that Windows Update is suddenly offering BIOS 0.1.1.19 as an "optional" update for the XPS 8930, even though I've already updated to 1.1.20. (Still don't know why WU puts 0. in front of all Dell's BIOS version numbers.) When WU previously offered an "optional" BIOS update to 0.1.18 for the XPS 8930, I ignored it because I'd already installed 1.1.18 directly from the Dell site. After a while WU decided to install it without permission, even though this version was already installed. Let's hope WU doesn't try to force downgrade BIOS back to 0.1.1.19 when 1.1.20 is installed.
XPS 8930, BIOS 1.1.20 update