Next week Windows 8.1 is officially released and ahead of that there is a firmware update for the Surface RT. At the beginning of October the Surface Pro received a firmware update readying the device for Windows 8.1 and there was nothing for the ARM powered device but yesterday’s update puts that right.
Microsoft don’t detail what the update contains, I hope it stops the problem of the device not waking from sleep correctly. Since installing Windows 8.1 Preview my device has frequent waking problems but at least the WiFi problem seems to be fixed. Windows 8.1 Preview it starting to creak on my machine and is really ready for the RTM version of Windows 8.1.