New firmware has been released for the Smart Controller. Here are the notable changes:
Added Dual Remote Controller mode (requires DJI GO 4 v4.3.16 or later)
Added a warning prompt if the remote controller compass requires calibration
Added an option to set the external microSD card as the default storage location
Added ability to update the built-in DJI GO 4 and DJI Pilot apps independently from the system update.
The full list of changes are available in the Smart Controller release notes on the Smart Controller downloads page.