Nintendo team has released the new system firmware V2.1.0. According to the official changelog, the new firmware does not matter much.
Improvements Included in Version 2.1.0
General system stability improvements to enhance the user’s experience
But users on GBAtemp report that version v2.1.0 patches the pegaswitch which is
webkit exploit running on the Nintendo Switch. The webkit exploit is based on the vulnerability of Nintendo Switch’s browser.
How to update Nintendo switch to V2.1.0?
1. In most situations, the Nintendo Switch will automatically download the most recent system update while it is connected online.
2. You can also manually start the update if necessary.
Turn on your wifi-System Settings-System-System Update