The Sony Xperia Z3+ and Xperia Z4 Tablet devices are now receiving firmware build number 32.2.A.0.224, following on from the Xperia Z5 family yesterday. This update reintroduces STAMINA battery mode for Android 6.0.1 Marshmallow, albeit with limitations as previously reported. The update also includes the 1 April 2016 Google security patches. We will include FTF firmware links below shortly.
DOWNLOAD FTF Firmware Files
Thanks Daniel and Mohamed!