SteamVR has been hotfixed with the following changes.

If you encounter issues with this update, please post in the SteamVR Bug Report forum. If possible, please include a system report to aid in tracking down your issue.

Valve Index:

• Automatic recovery of interrupted or unfinished wireless receiver firmware updates. If your firmware update did not complete properly, restart SteamVR and follow the recovery prompts.
• Fix cases where “tether disconnected at HMD” would trigger in unusual USB topologies even when the tether was connected.

SteamVR Home:

• Fixed controller tracking hitches on Rift S