That is a great question. The January update, which will be available later today, includes a few improvements for Surface with Windows RT.This update provides System Firmware (UEFI) improvements including:
Improvements to audio playback when in Connected Standby
Additional capabilities for handling firmware updates during low battery situations.
I hope this is helpful, please let me know if you have any further questions
To check for updates:
Open PC Settings, by swiping in from right edge (or, if using a mouse, point to upper-right corner of screen)
Tap or click Settings
Tap or click Change PC settings
Under PC settings, tap or click Windows Update
Tap or click Check for Updates
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