[Optimus L3, L5, L7 Q&A, Help & Troubleshooting] sevoir:
Upgrade... (if you want)

Newly Firmware is V10J (HUN) (http://lg-phone-firmware.com/index.php?id_mod=21)

Enable "unknown source" (Settings > Security > Unknown sources)

Download Framaroot (https://drive.google.com/file/d/0Bwm3o_n8de7iTXhwOEFoc0dfdlk/edit?usp=sharing)

Install it.

Choose "Gandalf exploit" and run it. ( if output is Succes, you have root access)

Download Root Browser (https://drive.google.com/file/d/0Bwm3o_n8de7iTDNvNXlmR05sb3M/edit?usp=sharing)

Install it.

Open Root Browser:

Navigate to /system/app directory

You can delete these apps:

ApplicationManagerbin.odex (extra apps, this LG stuff for available extra apps, unnecessary)

ApplicationManagerbin.apk

Books.odex (Google Books)

Books.apk

Calculatorbin.odex (Calculator)

Calculatorbin.apk

Calendarbin.odex (Calendar)

Calendarbin.apk

CalendarProviderbin.odex (something for Calendar)

CalendarProviderbin.apk

CBbin.apk (Provider messages - unnecessary)

CBbin.odex

ChromeBookmarksSyncAdapter.odex (Sync Chrome bookmarks)

ChromeBookmarksSyncAdapter.apk

ChromeWithBrowser.odex (Chrome browser)

ChromeWithBrowser.apk

EmailWidgetbin.odex (Email widget, unnecessary)

EmailWidgetbin.apk

FmRadio3.odex (FM radio, unnecessary)

FmRadio3.apk

Gmail.odex (Gmail, reinstall from Market with Link2SD if you need)

Gmail.apk

GMS_Maps.odex (Gmaps, reinstall from Market with Link2SD if you need)

GMS_Maps.apk

GoogleCalendarSyncAdapter.odex (Google Calendar Sync, reinstall from Market with Link2SD if you need)

GoogleCalendarSyncAdapter.apk

GoogleDrive.odex (Google Drive, reinstall from Market with Link2SD if you need)

GoogleDrive.apk

GoogleFeedback.odex (Google feedback, unnecessary)

GoogleFeedback.apk

GoogleTTS.odex (Google voice > text, unnecessary)

GoogleTTS.apk

Hangouts.odex (Google Talk, reinstall from Market with Link2SD if you need)

Hangouts.apk

LGBackupbin.odex (LG backup, unnecessary)

LGBackupbin.apk

LGDMSClient.odex (LG software-update, unnecessary)

LGDMSClient.apk

LGEmailbin.odex (Email, unnecessary)

LGEmailbin.apk

LGHome3_Theme_Biz.odex (LG Home theme [Biz], if you use defaul [Optimus theme])

LGHome3_Theme_Biz.apk

LGHome3_Theme_Cozywall.odex (LG Home theme [Cozywall], if you use defaul [Optimus theme])

LGHome3_Theme_Cozywall.apk

LGHome3_Theme_Marshmallow.odex (LG Home theme [Marshmallow], if you use defaul [Optimus theme])

LGHome3_Theme_Marshmallow.apk

LGSearchWidgetProvider.odex (Google search widget, unnecessary)

LGSearchWidgetProvider.apk

Magazines.odex (Google magazines, unnecessary)

Magazines.apk

Music2.odex (Music player, unnecessary)

Music2.apk

Musicbin.odex (Music player, unnecessary)

Musicbin.apk

MusicWidgetbin.odex (Music player widget, unnecessary)

MusicWidgetbin.apk

PlayGames.odex (Google PlayGames, unnecessary, reinstall from Market with Link2SD if you need)

PlayGames.apk

PlusOne.odex (Google+, unnecessary, reinstall from Market with Link2SD if you need)

PlusOne.apk

SmartShare.odex (unnecessary)

SmartShare.apk

Street.odex (Google Street, unnecessary, reinstall from Market with Link2SD if you need)

Street.apk

Velvet.odex (Google Search widget, unnecessary)

Velvet.apk

VoiceRecorderbin.odex (Voice recorder, unnecessary, reinstall from Market with Link2SD if you need)

VoiceRecorderbin.apk

VoiceSearchStub.odex (Voice search, unnecessary, reinstall from Market with Link2SD if you need)

VoiceSearchStub.apk

WeatherMultiCPbin.odex (Weather, unnecessary)

WeatherMultiCPbin.apk

WeatherThemebin.odex (Weather-theme, unnecessary)

WeatherThemebin.apk

Youtube.odex (Youtube, unnecessary, reinstall from Market with Link2SD if you need)

Youtube.apk

Install Link2SD from Google Play.

Unmount your sdcard, partitioning it to 2 slice (is you have 16GB sdcard: 8GB 8GB [fat32, fat32], [primary-primary]) on your computer

Put sdcard back to phone, mount it...

Open Link2SD > left side menu > Mount script rewriting - choose [fat16/fat32]

Restart your phone

Open Link2SD > right side menu > Settings > Auto linking

Use it.

I recommend App Backup & Restore app for quick reinstall your favoritue apps.

Sorry my english. (I use my phone with hungarian language, I don't know, apps label in English or other lang)