Sony users of the Xperia Z5, Xperia Z3+ and Xperia Z4 Tablet were having troubles with updating their devices until the middle of the summer, but now the Japanese manufacturer moved on and issued a new software update, bringing some security patches. The latest system update with a build number 32.4.A.1.54 According to sources, the Xperia Z5 family which includes the Xperia Z5 Compact and the Xperia Z5 Premium moved from build number 32.4.A.0.160 to 32.4.A.1.54. The size of the update is 400 MB and at first glance doesn't bring any dramatic feature or UI changes. Some suggest...
Source: https://www.gsmarena.com/sony_xperia_z5_family_firmware_update-news-27618.php