Hi, I'd like to give a short advice on how to check which firmware is installed on your devices.
Open the surface app (Startmenu -> Then type Surfaceor just click the Surface Tile, when it's visible.
Head to this section and notice the marked drivers:

Head to the Surface update history page here:
https://support.microsoft.com/de-de/help/4526363/surface-pro-7-update-history
Check the latest entries version numbers on top of the page, especially the UEFI firmwares.

Because there's not a newer firmware for the SAM right now, head a little bit downward to get the past updates from 2019 and expand it:

Lookout for the Surface System Aggregator Firmware(SAM)
If the version numbers match to the ones in your Surface app then you should be up to date.
Those firmwares will/should be updated by Windows Update. So regularly there should be no need to update the drivers manually.
I hope that this will help a little bit.
Best regards
Patrick