2.1.0
The 2.1.0 system update was released on March 27, 2017. This update was released for all regions.
Security flaws fixed: yes.
Change-log
This is the official changelog from Nintendo regarding this update:
Improvements Included in Version 2.1.0
- General system stability improvements to enhance the user's experience
System Titles
It's unknown exactly what titles were updated. The Hotspot List was not updated.
Browser
A browser vuln was fixed, see also here for v2.1 browser details.
FIRM Packages
Title 0100000000000819 wasn't updated. The only change in title 010000000000081A was that "/nx/package2" in the FS was updated.
NS-sysmodule
The NS-sysmodule was updated. 4 new funcs were added and 29 funcs were updated.