Apple is rolling out a firmware update for the MacBook USB-C Multiport adapter, which improves the compatibility and reliability of affected adapters. These include the Apple USB-C Digital AV Multiport Adapter or Apple USB-C VGA Multiport Adapter.
According to Apple's support website, this update contains the following:
Enough said, really. If you haven't received an update notification, make sure your adapter is correctly plugged into your MacBook and that you're rocking at least OS X El Capitan v10.11.4. Be sure to have all external devices disconnected from the adapter before you kick off the update process.
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