Bios upgrade often fix issue not documented as company do not want to publicize the fact than more and more they rush to market unpolished product, my XPS13 had issue that took 5-6 bios update to fix.
My desktop pc based on a mini shuttle barebone had issue with USB3 and it took a few firmware update to see it fixed, unless the company you are getting the bios from is not very good normally bios update are fairly safe to perform unless there's a power failure and even then some can easilly be re-flashed.
Dell do not usually have problem with bios update so it should be fairly safe to perform, you can search with the service tag to ensure it is the latest version for your hardware.
Bios update often contain cpu micro code update, add new cpu support etc, there's no reason to not update it if deemed safe eg: give it a few week to be filed tested...
Then take a deep breath and jump!
Edited by P00r, 20 May 2017 - 08:59 PM.