You may find many conflicted and different opinions about keeping your BIOS up to date. It's all coming down to personal preference.  If you feel better keeping your system BIOS up to date then you must take control of when to run the update and not allowing Windows update to run on its own. To do that, you will need to disable the UEFI firmware capsule updates feature in BIOS. As for the method to update, you need to perform update using USB drive, outside Windows for the latest firmware versions as they could not be update inside Windows very well.  The latest firmware XPS8930_1.1.30.exe  had been pulled from Dell website and just reposting recently.  
I downloaded the new BIOS for my XPS 8930 and it's impossible to install it with the .exe. I have to install it with a USB key that I don't have. Is it OK to don't touch the BIOS and let Windows 11 update my BIOS or I will later have some kind of problems? My current BIOS is 1.1.29Thank you.
XPS 8930, OK to let Windows 11 update my BIOS?