A very minor firmware update has been released for the LTE variants of the Sony Xperia M2 (D2303, D2306) and the Xperia M2 Aqua (D2403, D2406). Build number 18.3.1.C.1.17 compares to the last version (18.3.1.C.1.16) that only recently started to roll. We understand that the update introduces a new bootloader, with a separate recovery partition. The update is only started to hit a few regions, but you can also download the FTF firmware from the links below.
DOWNLOAD FTF firmware files
Xperia M2 (D2303) 18.3.1.C.1.17 – Middle East Generic [Android 4.4.4]
Xperia M2 (D2306) 18.3.1.C.1.17 – US Generic [Android 4.4.4]
Xperia M2 Aqua (D2403) 18.3.1.C.1.17 – Switzerland Generic [Android 4.4.4]
Xperia M2 Aqua (D2406) 18.3.1.C.1.17 – Commercial and Journalists [Android 4.4.4]
Thanks Panagiotis and Vinicius!