Upgrade Firmware

Cyanogenmod 12.1 custom rom is finally available for samsung galaxy s3 mini I8190.Samsung galaxy s3 mini is midrange product from samsung with nova thor chipset which is a dual core chipset clocked at 1Ghz coupled with 1gb of ram and Mali 400 GPU.It has 1gb internal storage with micro sdcard slot expansion upto 32gb.Display is of amoled type with a resolution of 480x800 translating to a pixel density of 233.Primary camera on this device is 5mp while secondary camera is VGA.Finally it is powered by a lithium ion  1500mah battery.

It was launched with android 4.1 jellybean and didn't receive updates to any future versions of android.But we are never short of custom roms.We have lot of android lollipop roms for our device.If you have rooted your galaxy s3 mini and want to flash a custom rom on it then you can flash Cyanogenmod rom and enjoy features of android lollipop along with some other goodies.Since this custom is specific to galaxy s3 mini with model number I8190 so try don't flash it on other model numbers as it causes brick.
After rooting your s3 mini I8910 you might have installed best apps for rooted device and customised it ,de-bloated,Moved apps to sdcard.But this alone will not improve its performance or battery life.You should definitely try a custom rom to over all other limitations.

Check your device model number first.To do this go to settings and then to about device,you will have your device model number.Confirm that you are using same model as  mentioned above.
Prerequisites:

• Charge your device to at least 80% so that you don't run into any problems while flashing rom.
• Backup all your apps and data on your s3 mini to external sdcard or computer as flashing Cyanogenmod rom will erase all the app data on your device including contacts.
• Enable usb debugging on your s3 mini.Of course you don't need to do this for sure but enable it.
• Download Cyanogenmod custom rom and gapps if you need them.
• Back up efs and modem partition on your samsung galaxy s3 mini.
• You must have a custom recovery like twrp or cwm installed on your mobile.

Install Cyanogenmod Custom Rom on galaxy s3 mini I8190:

Cyanogenmodmod is one of the best custom roms available in android development ecosystem.They support lot of devices.This rom is based on android open source project with lot of added features .As of now we don't have official support for this device.

• Must See: Omni Lollipop rom for samsung galaxy s3 Mini

Features:

• Theme engine: Theme engine is from the cyanogenmod custom rom which basically changes the look user interface from lock screen  to ring tones all the way up to boot animations.The speciality of the theme engine is the ability to choose individual elements of every theme you have installed.So you like the ring tons and wallpapers of one theme and icons of other theme then you can have them at a time.Just open the theme chooser and you will understand how to do it.
• Performance control:A default cpu manager app to control frequencies and governors.You can adjust cpu frequencies and also set them on boot too.
• Trebuchet: This is the default launcher that ships with cyanogenmod rom.But if you flash gapps then you might loose this.It doesn't have too many features like nova or other launchers but its simple and fast.
• Software Updates: Cyanogenmod rom is usually available in three types one is nightlies which gets updated with new features every night and are quite stable for daily usage.second one is the snapchat which is monthly build version which will be stable version and other one is the release candidate.Some times nightlies are considered must stable than the snapshots. 
• Status bar:Status bar has lot of tweaks which include a brightness slider.Slide in status bar to adjust brightness of the screen.Double tap on status bar to sleep device and also network speed indicator for on going traffic info.