Xperia J has certified the new FW (11.2.A.0.31)

Recently, a certificate for a new firmware version for the Sony Xperia J (ST26i) has been certified on the website PTCRB (11.2.A.0.31 code). Hopefully this update will bring small improvements and fixing basic errors that users are facing from Android Jelly Bean version current (11.2.A.0.21). Under this certification
period, only a few weeks this updated version will be available for use.

Source: Xperia Blog