[Xperia Z1 Q&A, Help & Troubleshooting] DorianX:
My recommendation (And what I'm using):

- Stock .157 (downloaded with xperifirm) rooted and XZDualRecovery installed.

- Deodex:

C6903 .108 http://xdaforums.com/showthread.php?t=2797365

C6902 .157 http://xdaforums.com/showthread.php?t=3003481

- Debloat Script (modded by me. It will delete A LOT off bloat but your phone will work normally, this is the list:

"/data/app/com.box.android-1.apk", "/data/app/com.evernote-1.apk", "/data/app/com.facebook.katana-1.apk", "/data/app/com.linkedin.android-1.apk", "/data/app/com.mobisystems.office-1.apk", "/data/app/com.pixlr.express-1.apk", "/data/app/com.sony.tvsideview.phone-1.apk", "/data/app/com.sonymobile.androidapp.diagnostics-1.apk", "/data/app/com.twitter.android-1.apk", "/system/app/AnonymousData.apk", "/system/app/AptxNotifier.apk", "/system/app/Backup-wizard.apk", "/system/app/BasicDreams.apk", "/system/app/Books.apk", "/system/app/com.sonyliv.apk", "/system/app/com.sard.apps.xalert.apk", "/system/app/com.infibeam.allthingsd.apps.spinr.apk", "/system/app/CrashMonitorSystem.apk", "/system/app/device-monitor.apk", "/system/app/Drive.apk", "/system/app/EnchantedForest.apk", "/system/app/ExternalKeyboardJP.apk", "/system/app/Galaxy4.apk", "/system/app/GenieWidget.apk", "/system/app/Gmail2.apk", "/system/app/GoogleLyricsPlugin.apk", "/system/app/GoogleTTS.apk", "/system/app/Hangouts.apk", "/system/app/HoloSpiralWallpaper.apk", "/system/app/IddAgent.apk", "/system/app/JapaneseIME.apk", "/system/app/jp.naver.line.android.apk", "/system/app/KeyChain.apk", "/system/app/Magazines.apk", "/system/app/MagicSmokeWallpapers.apk", "/system/app/Maps.apk", "/system/app/NoiseField.apk", "/system/app/PacProcessor.apk", "/system/app/PhaseBeam.apk", "/system/app/PhotoSlideshow.apk", "/system/app/PhotoTable.apk", "/system/app/phone-usage.apk", "/system/app/PlayGames.apk", "/system/app/PlusOne.apk", "/system/app/POBoxSknMono.apk", "/system/app/POBoxSknSelector.apk", "/system/app/talkback.apk", "/system/app/RemoteControlService.apk", "/system/app/SemcAutoPowerOff.apk", "/system/app/SemcCrashMonitor.apk", "/system/app/SemcDlna.apk", "/system/app/SemcCnapProvider.apk", "/system/app/SemcWarrantyTime.apk", "/system/app/ShutDownAnimation.apk", "/system/app/socialife.apk", "/system/app/SomcDlna.apk", "/system/app/SomcSketch.apk", "/system/app/SonyEntrance.apk", "/system/app/SonySelectWidget.apk", "/system/app/StartupFlagV2.apk", "/system/app/Stk.apk", "/system/app/Street.apk", "/system/app/textinput-chn.apk", "/system/app/UnsupportedHeadsetNotifier.apk", "/system/app/Videos.apk", "/system/app/VisualizationWallpapers.apk", "/system/app/VMwareReady.apk", "/system/app/WikipediaPlugin.apk", "/system/app/YouTube.apk", "/system/app/YouTubeKaraokePlugin.apk", "/system/app/YouTubePlugin.apk", "/system/priv-app/BackupRestoreConfirmation.apk", "/system/priv-app/DtcpCtrl.apk", "/system/priv-app/EnterpriseService.apk", "/system/priv-app/ExternalStorageProvider.apk", "/system/priv-app/FBCalendarSync.apk", "/system/priv-app/FBMusicLike.apk", "/system/priv-app/GoogleBackupTransport.apk", "/system/priv-app/helpapp.apk", "/system/priv-app/infoeye.apk", "/system/priv-app/InputDevices.apk", "/system/priv-app/livewaremanager.apk", "/system/priv-app/MyXperia.apk", "/system/priv-app/PicoTts.apk", "/system/priv-app/ProxyHandler.apk", "/system/priv-app/retaildemo.apk", "/system/priv-app/SEMCFacebookProxy.apk", "/system/priv-app/ShareApplication.apk", "/system/priv-app/SharedStorageBackup.apk", "/system/priv-app/socialcast.apk", "/system/priv-app/SocialEngineCore.apk", "/system/priv-app/SocialEngineFacebookPlugin.apk", "/system/priv-app/SocialEngineFacebookShareFrwkPlugin.apk", "/system/priv-app/SocialEnginePicasaPlugin.apk", "/system/priv-app/SocialEngineTwitterShareFrwkPlugin.apk", "/system/priv-app/SomcPhotoAnalyzer.apk", "/system/priv-app/SomcPlayAnywhere.apk", "/system/priv-app/SomcPodcast.apk", "/system/priv-app/SOMCTwitterAccount.apk", "/system/priv-app/sonyselect.apk", "/system/priv-app/Tag.apk", "/system/priv-app/Velvet.apk", "/system/priv-app/xperialounge.apk", "/system/etc/customization/applications/com.box.android.apk", "/system/etc/customization/applications/com.evernote.apk", "/system/etc/customization/applications/com.linkedin.android.apk", "/system/etc/customization/applications/com.sony.tvsideview.phone.apk", "/system/etc/customization/applications/com.twitter.android.apk", "/system/vendor/overlay/overlay-semcalbum-flickr-on.apk", "/system/vendor/overlay/SmartConnect-Overlay-295.apk"

): http://www.mediafire.com/?u08n2189s8xbmy2

- SuperUser Mod: http://xdaforums.com/showthread.php?t=2858356

- 20mp Camera Mod: http://xdaforums.com/showthread.php?t=2730097

- Torch Boost Mod (medium just torch): http://xdaforums.com/showthread.php?t=2886705

- Stereo Mod: http://xdaforums.com/showthread.php?t=2822691

That's it! I have a stable phone, without crap and a few cool mods installed.