No es seguro borrarlas :
AccountAndSyncSettings.apk --- Account and Sync Settings
AdobeFlashPlayer.apk --- Adobe Flash Player
AntHalService.apk --- Hardware Abstraction Layer
ApplicationsProvider.apk --- Buscador de el proveedor de actividades (ASP service)
Bluetooth.apk --- Bluetooth
bootinfo.apk --- Agente de descargas
CalendarProvider.apk --- Almacenamiento de calendario
CertInstaller.apk --- Instalador de certificados
CredentialManagerService.apk --- Servicio de Credential Manager
CustomizationProvider.apk --- Regionalización
CustomizationSimPayType.apk --- Regionalización
CustomizedApplicationInstaller.apk --- Regionalización
CustomizedSettings.apk --- Regionalización
DefaultCapabilities.apk --- Posibilidades de Hardware
DefaultContainerService.apk --- Paquete de ayuda de acceso a la web
device-monitor.apk --- "Plug and play"
DMClient.apk --- Actualizador de Software
DownloadProvider.apk --- Market Download Manager
DrmDialogs.apk --- Servicio de sincronización DRM
DrmProvider.apk --- Portección de almacenamiento de contenido DRM
enhancedusbux.apk --- Driver USB
FastDormancy.apk --- Network Fast Dormancy
FmRxService.apk --- Servicio de FM ( Radio )
genericappinstaller.apk --- Instalador de aplicaciones
GoogleBackupTransport.apk --- Copia de seguridad de datos y apps
GoogleCalendarSyncAdapter.apk --- Sincronización de calendario
GoogleContactsSyncAdapter.apk --- Sincronización de contactos
GoogleServicesFramework.apk --- Servicios del framework de Google
InfiniteView.apk --- Información de contactos
LiveWallpapersPicker.apk --- Cambiar fondos animados
LocalContacts.apk --- Contactos del teléfono
Maps.apk --- Google Maps
MarketUpdater.apk --- Descargar del Google Play
MediaProvider.apk --- Almacenamiento multimedia (Tonos de llamada , notificaciones)
MtpAppGB.apk --- MTP ( USB )
NetworkLocation.apk --- Network Location Manager (Location Services, Check-in, Geo-tagging)
OMAClientProvisioning.apk --- OTA network settings download
OmaV1AgentDownloadServices.apk --- OTA services download and purchase/billing services
PackageInstaller.apk --- package installer
Phonebook.apk --- Phonebook
PicoTts.apk --- SVOX Text To Speech service (used by navigation/translators/dictionaries)
ReadyToRun.apk --- OMA Sync extension
SemcCameraApplication.apk --- Camera
SemcContactsProvider.apk --- Contacts Storage
SemcHdmiControlService.apk --- HDMI CEC
SemcHdmiEnabler.apk --- HDMI
SemcPhone.apk --- Keypad Dialer
SemcSettings.apk --- Sony Ericsson Settings Menu > Connectivity/Settings Download
SemcTelephonyProvider.apk --- Dialer Storage
ServiceMenu.apk --- Service Menu
Settings.apk --- System Settings
SettingsProvider.apk --- Settings Storage
ShutDownAnimation.apk --- Shutdown Animation
SoundPicker.apk --- Sound picker
Sync.apk --- OMA account services
SystemUI.apk --- Notification bar
Talk.apk --- Google Talk
TtsService.apk --- Android Text To Speech Service
usb-mtp-update-wrapper.apk --- MTP extension polling
usb-mtp-vendor-extension-service.apk --- Sony Ericsson MTP extension
UseragentProvider.apk --- User Agent Storage
UserDictionaryProvider.apk --- user dictionary storage
Vending.apk --- Android Market
VerifyCertificatesDummyAppApplication.apk --- Certificate identifier
VerifyCertificatesDummyAppMedia.apk --- Certificate identifier
VerifyCertificatesDummyAppPlatform.apk --- Certificate identifier
VerifyCertificatesDummyAppShared.apk --- Certificate identifier
VoiceDialer.apk --- Voice Dialer
VoiceSearch.apk --- Voice Search
VoipCallLogProvider.apk --- VOIP Call Log
VpnServices.apk --- VPN Services
WapiCustomization.apk --- WAP settings
WapPush.apk --- WAP push (for receiving MMS)
Pueden ser borradas
Las apk con asterisco son nuevas en 2.3.3
AccessoryKeyDispatcher.apk --- event listener (unsure of trigger, hardware and handsfree keys work without it.)
Calculator.apk --- default calculator
CdfInfoAccessor.apk --- Software Component Descriptions
chinesetextinput.apk --- chinese keyboard
com.sonyericsson.androidapp.foursquare_ext_ts3.apk --- Timescape Foursquare Extension
com.sonyericsson.androidapp.timescapefeedsplugin.a pk --- Timescape Feeds
com.whatsapp.apk --- Whatsapp
*CoreNotificationPublisher.apk --- Lock Screen Notifications
CrashSMS.apk --- Diagnostics Tool (debug helper)
datatrafficswitch.apk --- mobile data on/off widget
DigitalClockWidget.apk --- clock widget
DownloadProviderUi.apk --- default browser downloads folder
EventStream.apk --- Timescape
EventStreamPluginCallLog.apk --- Timescape Call Log Extension
EventStreamPluginFacebook.apk --- Timescape Facebook Extension
EventStreamPluginTelephony.apk --- Timescape Telephony extension
EventStreamPluginTwitter.apk --- Timescape Twitter extension
facebook.apk --- Facebook
*FBCalendarSync.apk --- Sony Ericsson Facebook Integration Calendar Sync
*FBMediaDiscovery.apk --- Sony Ericsson Facebook Integration Media Discovery
*FBMusicLike.apk --- Sony Ericsson Facebook Integration Music Like
*FBNotificationPublisher.apk --- Sony Ericsson Facebook Integration Facebook Notifications
*FBSetupwizard.apk --- Sony Ericsson Facebook Integration Setup Wizard (not needed to setup or for FB Integration to work)
GenieWidget.apk --- News and Weather
Gmail.apk --- Gmail app
GoogleFeedback.apk --- Market Feedback Agent (forceclose reporting for apps installed from Market)
GooglePartnerSetup.apk --- Google Partner Setup (no longer needed after setting up Gmail)
GoogleQuickSearchBox.apk --- google quick search box
HTMLViewer.apk --- HTML viewer (view HTML files directly from file manager)
IddAgent.apk --- Anonymous Usage Stats
JapaneseIME.apk --- japanese keyboard
LearningClient.apk --- learns user typed words for default keyboard
letsgolf_A_353.apk --- Let's Golf game
LiveWallpapers.apk --- Live wallpapers pack
LivewareManager.apk --- Liveware Manager
MagicSmokeWallpapers.apk --- Live wallpaper
MediaWidget.apk --- Media shortcuts widget
MediaUploader.apk --- My Uploads for Youtube uploading (not needed if just watch Youtube)
MusicWidget.apk --- default Music player widget
*NotificationProvider.apk --- Lock Screeen Notifications Storage
officesuite.apk --- Office Suite
OmaDatasyncService.apk --- Sony Ericsson Sync
PhotoWidget.apk --- Picture Frame widget
*playnowclientarvato.apk --- Playnow Store (replaces the 2 APKs in the list directly below)
playnowappinstaller.apk --- Playnow updater
playnowclient.apk --- Playnow
POBoxSknPink.apk --- japanese keyboard skin
POBoxSknWood.apk --- japanese keyboard skin
Protips.apk --- Pro Tips widget
qcsemcservice.apk --- RIL extension for default browser
Radio.apk --- FM radio
retaildemo.apk --- retail demo
SecureClockJava.apk --- web clock service (some DRM or Secure services may use this, restore if you need it.)
SemcCrashMonitor.apk --- debugger
SemcDlna.apk --- media server
*SEMCFacebookService.apk --- Sony Ericsson Facebook Integration Service
SEMCSetupWizard.apk --- setup wizard
SemcVideoEdit.apk --- video editor
SoundRecorder.apk --- sound recorder
StatusSwitch.apk --- Status switch widget
Stk.apk --- Sim Tool Kit
Street.apk --- Google Street view
SyncWizard.apk --- Sony Ericsson Sync Account
timescapelegacywrapper.apk --- Timescape plugin
TimescapeSpline.apk --- Timescape widget spline
TimescapeWidget.apk --- Timescape widget
touchnote.apk --- Touch notes postcard
trackid.apk --- TrackID
*UnsupportedHeadsetNotification.apk --- Possibly a notification when pairing with unsupported bluetooth headsets
usersupport.apk --- Support
VisualizationWallpapers.apk --- Live wallpaper
WallpaperPicker.apk --- Sony Ericsson Wallpapers
widgetdigitalclock.apk --- clock widget
widgetonoff.apk --- widget on/off toggles
YouTube.apk --- YouTube
Pueden ser sustituídas:
Browser.apk --- default web browser
Calendar.apk --- default calendar
Conversations.apk --- default messaging
Home.apk --- default home launcher
SemcDeskClock.apk --- default clock and alarm
SemcEmail.apk --- default email app
SemcGallery3D.apk --- default gallery
SemcMusic.apk --- default music player
textinput-tng.apk --- default keyboard
Warning: No debes sustituirlo hasta haber instalado otro launcher y comprobado que funciona.
Note: Es recomendable que las apps que dependan del calendario sean sincronizadas con él antes de borrarlo.
Note: Quizás tengas problemas para enviar y recibir MMS.
Note: Borrarás la alarma , así que ten cuidado.
Me parece que esto es suficiente y lo importante , si quereis podeis ver el post original aquí, explica como borrar las actualizaciones de algunas apps de sistema:
http://forum.xda-developers.com/show....php?t=1089470