Previously, the company has rolled out the Android 5.0 Lollipop update for the same Xperia Z series since march.This list includes devices like Sony Xperia Z, Xperia Z1, and Xperia Z1 Compact.
This update is paused because of the Showstopper issue. Moreover, a new submission is now expected on 10 July.
On the other news, the smaller version of the Xperia Z4 - likely to be called the Z4 Compact - will reportedly be unveiled on May 13, according to a report from Russian website MobilTelefon.
Android 5.1 also introduces dual SIM support as a built-in Android feature. Android 5.1 brings some much-needed clarity to Lollipop's somewhat confusing screen pinning feature, which was designed to make it easier to lock kids or guest users into a particular app.
Device Protection in Android 5.1 will help to secure your device even if it's lost or stolen. With this feature enabled, a thief won't be able to use your device - even after factory resetting it - without having your Google account login details.
And some other minor changes are New animations in Clock app, Contacts lose colored overlay and Google+ linkage, Sticky soft keys fix, Hide 'Heads-up' notifications without dismissing, A new status bar icon when there's no SIM inserted, NuPlayer now the default streaming player.