Reason to do it : debloat ( less crappy apps) / more free ram / slightly increase of battery life WARNING: This removes some functionality that may be useful to some users. Do a full backup before starting to remove apps !!! Do it at your own risk !!! My device: Redmi 3s 2/16 Gb with fingerprint reader OS: Eu rom ( xiaomi.eu_multi_HM3SHM3X_V18.104.22.168.MALCNDG_v8-6.0 ) What you need: 1.Unlocked ,Rooted device with custom recovery like TWRP and a fresh full backup 2.Lucky Patcher or Titanium Backup Pro and others ... ( i used Lucky Patcher , download it from here : https://lucky-patcher.netbew.com/download/ ) List of safe to remove System apps ( not frozen ) : AntiSpam.apk BackupReceiver.apk BookmarkProvider.apk BugReport.apk CloudPrint2.apk CloudService.apk FileExplorer.apk ( replaced with RootExplorer ) GoogleCalendarSyncAdapter.apk GoogleContactsSyncAdapter.apk GoogleTTS.apk HTMLViewer.apk KingSoftCleaner.apk KSICibaEngine.apk LiveWallpapersPicker.apk Metok.apk MiGalleryLockscreen.apk MiLinkService.apk MiuiVideo.apk ( replaced with MX player pro ) NetworkAssistant2.apk PartnerBookmarksProvider.apk PicoTts.apk PowerKeeper.apk QuickSearchBox.apk SecurityAdd.apk SecurityCoreAdd.apk TouchAssistant.apk TranslationService.apk Updater.apk ---don't remove ! can cause problems,like force close ,system fail --- XiaomiAccount.apk ---don't remove ! can cause problems,like force close ,system fail --- XMRemoteController.apk -------------------------------- Backup.apk BackupRestoreConfirmation.apk Browser.apk ( replaced with other ) CellBroadcastReceiver.apk CleanMaster.apk CloudBackup.apk DownloadProviderUi.apk FindDevice.apk ---don't remove ! can cause problems,like force close ,system fail --- GoogleBackupTransport.apk MiDrop.apk Mipub.apk MiuiGallery.apk ( replaced with Galery2 from CM 13 rom) Music.apk ( replaced with other ) SmartCardService.apk SpacesTrustAgent.apk VpnDialogs.apk Weather.apk WeatherProvider.apk YellowPage.apk Again this is the list of apps i removed from my own device ( this is how i like it ). WARNING: This removes some functionality that may be useful to some users. -> you don't have to remove all of them !!! <- This is not a complete list ,the are more system apps which could be removed safely without causing the device to crash or popping up force close warnings.