Hello,
With new BIOS updates, the company is able to take its own experience overtime, and the experience of the public to create for a more stable platform. This update could have changed for many reasons, but all reasons tie into platform stability.
There isn't anything you should be worried about (if you are worried) as it's the manufactures themselves who are applying changes to the hardware.
Hope I was of some help!
- Nate of Ralleon Custom Built