The Japan-only 9.1.0-20J system update was released on October 10(11 in Japan), 2014.

Change-log

See here for the Japanese changelog. Among other things, this added theme support to the JPN Home Menu.

System Titles

The following titles were updated: Home Menu and CVer.

The version of New3DS application title 000400102002CA00 was changed to v0, originally this title was added 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.

See Also

System update report: [1]