Follow the given step-by-step guide to taste the tweaks and customizations of the CyanogenMod 12 ROM based on Android 5.0.2 Lollipop on your G2 Mini:
Step No 1:-First, download the Android 5.0.2 Lollipop CM12 ROM(cm-12-20150223-UNOFFICIAL-g2m.zip)and Google Apps .zip files on the desktop of your PC for your LG G2 Mini. Do not extract ROM .zip file.
Step No 2:-Connect theLG G2 Mini to the PC using its USB Data Cable and mount the Mass Storage of the phone.
Step No 3:-Transfer the downloaded ROM and Google Apps files to the root folder of your SD card on the device.
Step No 4:-Now, disconnect the device from the PC and turn itOFFin order to boot into Recovery Mode.
Step No 5:-TurnONthe G2 Mini while pressing and holdingVolume Up+Powerkeys at the same time for a while until the device enters into Recovery Mode.
Step No 6:-Go back to the main recovery menu and perform a full data wipe. This includesDalvik cache, Cache, System, Factory data reset.
Step No 7:-Go back the main Recovery menu and chooseinstall zip from sdcard>choose zip from sdcard.
Step No 8:-Find the ROM and Gapps files that you’ve already transferred to the root folder of your SD Card inStep No 3. Select the Lollipop ROM file and proceed the installation process.
Step No 9:-Once the ROM is successfully installed on your LG G2 Mini, install Google Apps package by following the same procedure as given above.
Step No 10:-After the installation of CM12 Android 5.0.2 ROM and Google Apps, selectreboot system nowto reboot the LG G2 Mini.
It will take about 5 minutesto boots up for the first time after installing ROM on your phone.
Done!You have successfully updatedLG G2 Mini to Unofficial CyanogenMod 12 custom build based Android 5.0.2 Lollipop.