Improvements Included in Version 6.0.0 (Distributed 9/18/2018)
Nintendo Switch Online* features and functionality have been added, including:

Save Data Cloud
User your internet connection to back up game save data for compatible games
Some games are not compatible with Save Data Cloud
To manage save data, head to System Settings > Data Management > Save Data Cloud
*Nintendo Switch Online membership (sold separately) and Nintendo Account required for online play. Not available in all countries. Internet access required for online features. Save Data Cloud available in compatible games. Terms apply. To learn more, click here.

Added the following system functionality

Upload up to four Album screenshots at once on supported social network services
Only one captured video can be uploaded at once
Select from six new Captain Toad icons for your user
To edit your user icon, head to your My Page on the top left of the Home Menu > Profile
The term "active console" has been renamed "primary console" in Nintendo eShop
You can play your digital software and content on non-primary consoles by linking your Nintendo Account
Playing software in multiple consoles has certain restrictions
Display of Nintendo Switch News articles will be limited to match the restricted software parental controls setting selections
Please note that the restriction will only apply to News articles distributed after the release of version 6.0.0.
Change the layout of the USB keyboard to the desired language
To change the language, head to the System Settings > System > USB Keyboard
Removed the following system functionality

After installing the system update, it will no longer be possible to unlink your Nintendo Account from your Nintendo Switch user
General system stability improvements to enhance the user's experience, including:

Compatibility improvements have been made for a controller licensed by Nintendo

Improvements Included in Version 6.0.1 (Distributed 10/08/2018)
General system stability improvements to enhance the user's experience, including:
Resolved an issue where internet connection test does not display correct results for download and upload speed
Resolved an issue where some licensed controllers' motion controls such as tilt function respond incorrectly

Improvements Included in Version 7.0.0 (Distributed 01/28/2019)
Select from six new New Super Mario Bros.™ U Deluxe icons for your user
To edit your user icon, head to your My Page > Profile on the top left of the HOME menu
Added additional language support to the HOME Menu for Chinese (Simplified), Chinese (Traditional), and Korean
To change the language, head to the System Settings > System > Language
General system stability improvements to enhance the user's experienc

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Ver. 9.2.0 (Released March 2, 2020)
General system stability improvements to enhance the user's experience.

Ver. 10.0.0 (Released April 13, 2020)
Added a bookmark feature to News.
This feature allows you to bookmark your favorite news items.

A maximum of 300 news items can be bookmarked.
An internet connection is required to view bookmarked News items.
News items that are no longer available cannot be viewed, even if they were bookmarked.
Added an option to transfer software data between the system memory and an SD card.

Users can now transfer downloadable software, update data, and DLC from the system memory to an SD card (and vice versa).
Note that save data and some update data cannot be transferred to an SD card.
Added an option to remap the controller buttons.

Analog stick and button configurations can now be changed for each paired controller.
Custom configurations can be saved as favorites in System Settings > Controllers and Sensors.
Custom configurations are stored on the Nintendo Switch system.
Configurations can be customized for the following controllers: Joy-Con (L), Joy-Con ®, Nintendo Switch Pro Controller. Button configurations can also be customized on the Nintendo Switch Lite system.
This feature is not available for other controllers.
On each system, up to five favorite custom configurations can be saved for Joy-Con (L), five for Joy-Con ®, five for Nintendo Switch Pro Controller. Five configurations can also be saved as favorites for Nintendo Switch Lite.
Added a new section in User Settings for Play Activity Settings.

The options for "Display play activity to:" and "Delete Play Activity" have been moved from Friends Settings to the new Play Activity Settings.
Added new selections to the lineup of user profile icons.

Select from 6 new icons from the Animal Crossing: New Horizons game for your user.
General system stability improvements to enhance the user's experience.

General system stability improvements to enhance the user's experience.