Microsoft recently released new firmware updates for both the fifth-generation Surface Pro and the Surface Pro 6. Available for anyone running the Windows 10 April 2018 Update or higher, the changelog says that they improve system stability, and that's it. The date on the update is August 29, although they only appeared on the Surface Update History page recently, which is common.
Here's the full changelog:
|Windows Update History Name||Device Manager Name|
|Surface – System – 18.104.22.168||
Surface Storage Firmware Update – System devices
A week before the date of this update, many users began reporting battery degradation issues for their Surface Pro 5 and 6 units. It's unclear if the new firmware updates are meant to resolve that issue, as many people that reported it said that the actual health of the battery seems fine, so an update should resolve it.
As usual, you can download the new updates via Windows Update. If you want to, you can also manually install the firmware and drivers bundle that's made for your device. You can find the package for the Surface Pro 5 here, and for the Surface Pro 6 here.