A Samsung Galaxy S4 update is currently available via a custom ROM. SlimSaber firmware that is based on Android 5.1.1 Lollipop has been released.

The 2013 flagship device, at launch, came pre-installed with Android 4.2.2 Jelly Bean. But currently, users can officially update the Samsung Galaxy S4 with Android 5.0 Lollipop, according to GSM Arena.

However, a post on Team Android shared that the SlimSaber Android 5.1.1 Lollipop custom ROM is now available for the smartphone. To install the custom firmware, users need to secure first the SlimSaber OS file as well as the GApps.

Download via a PC the appropriate SlimSaber zip file compatible for the Samsung Galaxy S4 units bearing the model number GT-I9500. Connect the smartphone to the PC via USB to copy and save the necessary download files into the root folder of the device or the microSD card.

To begin installation, turn off and boot the Samsung Galaxy S4 using the Recovery Mode by holding down three buttons simultaneously, the Home, Volume Up and Power buttons.When the smartphone is in the Recovery Mode already, back up all the important data and wipe them through the "wipe data or factory reset" option as well as the "wipe cache partition.

Head to the installation proper by picking the "choosing zip from sdcard" and choose the SlimSaber custom ROM zip file that was previously saved in the memory card.

Upon installing Androd 5.1.1 Lollipop firmware, Samsung Galaxy S4 users will find a range of sound setting options allowing them to fully enjoy the sound quality and music from the phone. The SlimSaber ROM is also expected to provide smooth and stable performance to experience the latest Lollipop goodies.

But before actually proceeding to install Android 5.1.1 Lollipop via SlimSaber ROM, users need to make sure first that their S4 unit has at least 80 percent battery power. This is to avoid any power interruptions during the installation process of the unofficial release.

A recovery tool is also important since all the data and settings saved in the phone need to be backed up first. Experts highly recommend the use of The Team Win Recovery Project (TWRP) and and the ClockWorkMod (CWM) to make a backup.

Samsung Galaxy S4 was released on April 2013. The 5-inch smartphone is equipped with an Exynos 5 Octa 5410 chipset. The display screen has a resolution of 1080 x 1920 pixels with a pixel density of 441 ppi.

Learn more about the specs of the Samsung Galaxy S4 in the video below, as posted on official Samsung's Youtube channel: