You can nowupdate Galaxy S4 Mini to Android 5.1.1using the popular CM12.1 custom ROM. Very close to AOSP, this custom firmware has all its features working smoothly making this a stable custom ROM. Here is how to update Galaxy S4 Mini to Android 5.1.1 based, feature-packed CM12.1.

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Prerequisites to update Galaxy S4 Mini to Android 5.1.1 CM12.1:

Create abackupof all important data in your Galaxy device.

Download and install USB drivers forSamsung Galaxy S4 Miniin your computer.Enable USB debugging option by pressingMenu>Settings>Applications. Navigate and tap onDeveloper Optionsto make sure thatUSB Debuggingis enabled.Make sure that recovery tool likeClockworkMod recoveryis installed.Ensure that your Samsung Galaxy S4 Mini LTE carries more than 70% of charge.

Note:This custom firmware flashing process is detailed specifically for Samsung Galaxy S4 Mini LTE model number I9195. Please do not try it on other Samsung or Android devices. Also note that this is an unofficial custom firmware and while it's reported to be stable, be cautious if you have no experience with beta versions of the custom ROMs.

How to update Galaxy S4 Mini to Android 5.1.1 CM12.1 unofficial:

Files required:download theCM12.1 Android 5.1.1 Lollipopcustom firmware fromhere; also download theGoogle Apps. Save both files on PC.

Here are the steps to update Galaxy S4 Mini to Android 5.1.1 CM12.1 Nightly:

Connect your SamsungGalaxy S4 Mini to your computer using USB cable and copy the downloaded files to the SD card of your Galaxy device.Disconnect the connection with PC and turn your Galaxy Minioff.Boot in to custom recovery mode: press and holdVolume Up, Downand thePowerbuttons simultaneously untilSamsunglogo shows up. Leave the keys for half a second and hold again. UseVolumekeys to scroll andPowerbutton to select -alternatively you can useQuick Boot appto reboot your Android device in recovery mode.Data wiping tasks: selectwipe data/factory reset>Yes. It will take a few minutes; once done, selectwipe cache partition.Next tap onAdvance>wipe Dalvik Cacheto wipe Dalvik cache data too.Selectinstall zip from sdcardfollowed bychoosezip from sdcard. Locate the Android 5.1.1 Lollipop based CM12.1custom ROMfile copied earlier and select it. Tap onyesto confirm installation and wait for the ROM installation to be completed.Once installation process is finished successfully, repeat the above step but chooseGAppsfile instead to install the Google apps package on your Galaxy S4 Mini LTE.Return to main recovery menu now and selectreboot system nowto boot up into the latest CM12.1custom ROM forSamsung GalaxyS4 Mini. It will take a bit of time during the first boot, so please be patient.Ta da! This was how to update Galaxy S4 Mini to Android 5.1.1 Lollipopbased CyanogenMod ROM!