Just days after Sony has tagged the Xperia M as a device that will not see any software updates, then along comes a new certification. The PTCRB website shows a new very minor firmware build certified for the Xperia M (C1904, C1905) in the form of 15.4.A.1.10, as well as the Xperia M dual (C2004, C2005) with build number 15.5.A.1.6. We’ll let you know if Sony does decide to release these updates.
Thanks Ahnaf and Zeke!