Samsung Galaxy Note 4 users on Sprint can now update their devices to the latest Android 5.1.1 Lollipop. The update also includes a fix that protects the handset from the Stagefright security problem.

The size of the Android 5.1.1 Lollipop update bundled with Stagefright patch is 615.69 MB. It installs the N910PVPU4COG5 software version for the SM-N910P variant of the Sprint Galaxy Note 4, Android Police reported.

According to Samsung, the update will install a fix for a problem with the message waiting indicator along with some miscellaneous patches. But the company did not reveal the exact details of the enhancements that will arrive with the new firmware update.

The 5.1 Lollipop OTA alert for Sprint users of Galaxy Note 4 indicates that it brings performance and device stability improvements. One needs to be aware of the fact that after installing the 5.1 Lollipop, users will not be able to downgrade to an older update.

Stagefright is one of the most serious Android OS security issues ever discovered by Zimperium Mobile Security. It allows hackers to remotely access sensitive and private content stored on the device by sending a malicious MMS to the user.

The Samsung Galaxy Note 4 is a phablet flagship from 2014. It comes with a Quad HD screen of 5.7 inches and is powered by Snapdragon 805 chipset that clocks at 2.7 GHz.

It features 3 GB of RAM, 32 GB native storage and 128 GB of external storage, 16 MP Optical Image Stabilization enabled camera on its rear and 3.7 MP front-facing camera. It is equipped with a huge battery of 3,220 mAh capacity.

Samsung is slated to announce the successor model for the Note 4, the Galaxy Note 5, on Aug. 13. It will also be announcing the Galaxy S6 Edge + on the very same day. Rumors claim that the South Korean tech giant has opted to announce and release both the handsets earlier in this month so that its sales will not be affected by Apple's release of the iPhone 6S and the iPhone 6S Plus in the next month.