The 9.0.0-20 system update was released on October 6, 2014.
System Titles
New3DS versions of most sysmodules were added with this upgrade.
This upgrade included 3 new sysmodules:
- NFC -- talking to NFC hardware (over I2C).
- DVM
- QTM -- camera headtracking? (over I2C).
For New3DS firmwares (NATIVE_FIRM, TWL_FIRM, ..), the ARM9 binary has an additional layer of crypto.