Sony Mobile has begun to roll out a new firmware update for the Xperia Z2 and Xperia Z2 Tablet with build number 23.4.A.1.264. The new Android 5.1.1 Lollipop firmware finally provides a full Stagefright fix and is currently rolling out to the following variants: Xperia Z2 (D6503) and Xperia Z2 Tablet (SGP511, SGP521). We would expect it to hit other variants over the coming week. Let us know your thoughts on the update in the comments below once you have upgraded.
DOWNLOAD FTF Firmware Files
Thanks cachanilla86 and Kurt!