To be honest we didn’t think that the Xperia E (C150X) would receive any further updates from Sony, but a small update has been rolling out over the last few days. The update moves the build number from 11.3.A.2.23 to 11.3.A.2.33. The firmware remains on Android 4.1.1.
Sony has not updated its official Xperia E support page with this new firmware so we don’t know what has changed. Users are reporting no tangible differences, so expect only small bug fixes. If you’ve upgraded let us know what changes you’ve noticed. The FTF file can be downloaded from here.