Android 5.1.1 is rolling out to Xperia Z1
Xperia Z1 is currently running on Android Lollipop OS which had received a few months ago and now it is going to receive Android 5.1 soon. Sony had announced in last month that they are going to rollout the update to Xperia Z1 in this month and the update already certified for Xperia Z3 and Z2. The next in line in Xperia Z series to receive the Android 5.1.1 update is the Xperia Z1. So Xperia Z1 will receive the update by the end of this month. According to previous schedule of rollout of Android Lollipop, Sony will rollout the update to Xperia Z1 first in Middle East countries and then in American and European countries.
Retail and unlocked editions of Xperia Z are going to receive the update sooner than carrier editions. Major carriers in the US will rollout the Android 5.1.1 update to Xperia Z1 in next month. In the UK also, carriers may rollout the Android 5.1.1 Lollipop in next month.
Android 5.1.1 for Xperia Z1 Compact and Xperia Z1 Tablet
Xperia Z1 Compact and Z1 Tablet also receives the Android 5.1.1 update along Sony Z1. But Sony will rollout the Android 5.1.1 update to Xperia Z1 Compact and Z1 Tablet later than Z1. Sony may advance the schedule to rollout to Xperia Z1, Compact and Tablet at the same time but it will be not possible in most conditions. So Compact and Tablet are going to receive the update in next month.
In this rollout too, the Retail and unlocked editions of Xperia Z1 Compact and Tablet will receive the update at first. Carrier locked editions will receive the update in August or September.