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
Xperia Z3+ (E6553) 32.2.A.0.224 Russia Generic (Android 6.0.1)
Xperia Z3+ Dual (E6533) 32.2.A.0.224 Malaysia Generic (Android 6.0.1)
Xperia Z4 Tablet Wi-Fi (SGP712) 32.2.A.0.224 Singapore Generic (Android 6.0.1)
Xperia Z4 Tablet LTE (SGP771) 32.2.A.0.224 Germany Generic (Android 6.0.1)
Thanks Daniel and Mohamed!