According to the changelogs the latest updates are dated February 13, and they deliver changes to improve system and battery stability on those devices. Here’s the list with changes for Surface Book, Pro, and Pro LTE Advanced.
Surface Book
Surface Embedded Controller Firmware — 90.2098.256.0 improves system stability. Surface Integration — 1.1.339.1 improves battery stability.
Surface Pro LTE Advanced
Surface System Aggregator Firmware — 233.2102.1.0 improves system stability.
Surface Pro
Surface System Aggregator Firmware — 233.2099.256.0 improves system stability.
The new February 2018 firmware update for Surface Pro and Surface Book should download and install automatically. However, if you have not received the update on your Surface, then go to Settings > Update & security > Windows Update and try to force the download manually. All content on this site is provided with no warranties, express or implied. Use any information at your own risk. Always backup of your device and files before making any changes. Privacy policy info.