Owners of the old Sony Xperia Z series devices will soon rejoice as Sony is finally rolling out the much anticipated Android 5.1.1 Lollipop firmware.

According to the company, the update will land on the following devices starting Sept. 9: Xperia Z, Xperia ZL, Xperia ZR, Xperia Tablet Z Wi-Fi, as well as Xperia Tablet Z LTE models.

The company, on the other hand, said the latest update can only be seeded to these specific variants, as of the moment: C6602 and C6603 variants (for Xperia Z); C6503 and C6506 variants (Xperia ZL); C5503 only (for Xperia ZR); SGP311 and SGP312 (for Xperia Tablet Z Wi-Fi); and SGP321 only (for Xperia Tablet Z LTE models).

In addition, the Xperia Blog confirmed the Stagefright exploit has not been totally patched in the update.

"Looks like the Stagefright exploit has not been fully patched in this update. We will attach some FTF firmware links in this post in due course, but in the meantime, if you have installed the update, let us know your initial impressions below," reads the blog post.

Devices will be in the form of build number 10.7.A.0.222 after applying the latest update.

Based on reports, the company earlier planned that the update would be released to the Xperia Z series in July, which is a little later than the original schedule.

Other reports are also quite disappointed that the StageFright security vulnerability has not been patched by the company in this update, saying other manufacturers have already rolled out fixes for this particular serious flaw.

Meanwhile, Tech Times reported in March the official announcement of Google on the release of Android 5.1 which brought a number of bug fixes as well as minor changes to the operating system.

In the report, it was revealed that the update was first rolled out to Google Nexus 6 and Nexus 9.

The update, according to Google, improves stability as well as performance and touts to offer some new features which include the following: support for multiple SIM cards, Device Protection as well as high-definition (HD) voice on compatible phones.

Photo: Alberto Ziveri | Flickr