Sony Mobile has begun to roll the Android 6.0.1 Marshmallow firmware update for the Xperia M4 Aqua and M4 Aqua Dual. New build number 26.3.A.0.131 has currently been released across select regions for most of the Xperia M4 Aqua variants.
We are hoping that Sony has included adoptable storage as part of the build, so once you have downloaded, please confirm either way in the comments below. We will include FTF firmware links below in due course, in the meantime, please also let us know your overall impressions.
Download FTF firmware for Xperia M4 Aqua – Build number 26.3.A.0.131 (Android 6.0.1 Marshmallow)
Update: Users are confirming that there is no adoptable storage unfortunately. Please see a video walk through below.