9.1.0-20J
The Japan-only 9.1.0-20J system update was released on October 10(11 in Japan), 2014.
Change-log[edit]
See here for the Japanese changelog. Among other things, this added theme support to the JPN Home Menu.
System Titles[edit]
The following titles were updated: Home Menu and CVer.
The version of JPN-region New3DS application title 000400102002CA00 listed in SOAP was changed to v0, originally this title was added under SOAP with the Oct 2 JPN-only "update" as v1. Note that this title wasn't actually changed, the TMD is identical besides the title-version. Both versions of this title already existed.
See Also[edit]
System update report: [1]