Officially, the Samsung Galaxy S4 Mini can only be updated using the Android 4.4.2 KitKat update, but adventurous users can opt to install Android 5.0 Lollipop, a more advanced firmware, by using a custom ROM.

The Samsung Galaxy S4 Mini was made available in the market on July 2013, originally running on Android 4.2.2 Jelly Bean. But according to GSM Arena's specs list, the smartphone is currently upgradable to Android 4.4.2 KitKat OS.

However, because of awesome XDA developers, it is now possible for Samsung Galaxy S4 Mini users to install Android 5.0 Lollipop on the smartphone. A custom firmware was rolled out for the phone with model number GT-I9190.

To check the S4 Mini's official model number, go to Settings >> About Phone >> Model Number.

Particularly, users can check out the CyanogenMod12 or CM12 custom ROM suitable for the S4 Mini. F4K, a team of XDA developers noted that the custom firmware is based on the Android Open Source Project or AOSP 5.0 Lollipop. Owners of Samsung Galaxy S4 Mini who will decide to install Android 4.4.4 KitKat update can expect an improved and more reliable performance on the handset.

To get the detailed installation instructions as well as the download links necessary to install Android 5.0 Lollipop update via the CM12 custom ROM, Samsung Galaxy S4 Mini users can check out this report from IB Times.

Moreover, there are important requirements to satisfy to ensure a successful upgrade process. First, the battery level needs to be 80 percent or higher before updating smartphone using a custom ROM such as the CyanogenMod12.

The appropriate USB drivers should also be installed on the PC so the Android device will easily connect with the computer for the update process.

Samsung Galaxy S4 Mini owners also need to turn on the USB Debugging Mode on the smartphone first before flashing the custom ROM on the device.