Sony M4 has a lot of preinstalled software.
To uninstall you need ADB tools and enter to adb shell.
pm uninstall -k --user 0 com.amazon.mShop.android.shopping
pm uninstall -k --user 0 com.android.carrierconfig
pm uninstall -k --user 0 com.android.facelock
pm uninstall -k --user 0 com.android.galaxy4
pm uninstall -k --user 0 com.android.noisefield
pm uninstall -k --user 0 com.android.wallpapercropper
pm uninstall -k --user 0 com.android.wallpaper.holospiral
pm uninstall -k --user 0 com.android.wallpaper.livepicker
pm uninstall -k --user 0 com.google.android.apps.photos
pm uninstall -k --user 0 com.google.android.videos
pm uninstall -k --user 0 com.google.android.youtube
pm uninstall -k --user 0 com.google.phasebeam
pm uninstall -k --user 0 com.mobisystems.fileman
pm uninstall -k --user 0 com.mobisystems.office
pm uninstall -k --user 0 com.s.antivirus
pm uninstall -k --user 0 com.sceee.psxandroid
pm uninstall -k --user 0 com.sonyericsson.advancedwidget.weather
pm uninstall -k --user 0 com.sonyericsson.android.addoncamera.artfilter
pm uninstall -k --user 0 com.sonyericsson.android.omacp
pm uninstall -k --user 0 com.sonyericsson.moviecreator
pm uninstall -k --user 0 com.sonyericsson.music
pm uninstall -k --user 0 com.sonyericsson.photoeditor
pm uninstall -k --user 0 com.sonyericsson.providers.cnap
pm uninstall -k --user 0 com.sonyericsson.soundenhancement
pm uninstall -k --user 0 com.sonyericsson.textinput.chinese
pm uninstall -k --user 0 com.sonyericsson.trackid
pm uninstall -k --user 0 com.sonyericsson.trackid.res.overlay_305
pm uninstall -k --user 0 com.sonyericsson.video
pm uninstall -k --user 0 com.sonyericsson.wallpaperpicker
pm uninstall -k --user 0 com.sonymobile.advancedwidget.topcontacts
pm uninstall -k --user 0 com.sonymobile.advancedwidget.worldclock
pm uninstall -k --user 0 com.sonymobile.android.addoncamera.soundphoto
pm uninstall -k --user 0 com.sonymobile.android.addoncamera.styleportait
pm uninstall -k --user 0 com.sonymobile.android.addoncamera.styleportrait
pm uninstall -k --user 0 com.sonymobile.androidapp.cameraaddon.areffect
pm uninstall -k --user 0 com.sonymobile.cameracommon.wearablebridge
pm uninstall -k --user 0 com.sonymobile.entrace
pm uninstall -k --user 0 com.sonymobile.entrance
pm uninstall -k --user 0 com.sonymobile.gettoknowit
pm uninstall -k --user 0 com.sonymobile.moviecreator
pm uninstall -k --user 0 com.sonymobile.moviecreator.rmm
pm uninstall -k --user 0 com.sonymobile.music.googlelyricsplugin
pm uninstall -k --user 0 com.sonymobile.music.wikipediaplugin
pm uninstall -k --user 0 com.sonymobile.music.youtubekaraokeplugin
pm uninstall -k --user 0 com.sonymobile.music.youtubeplugin
pm uninstall -k --user 0 com.sonymobile.mx.android
pm uninstall -k --user 0 com.sonymobile.playanywhere
pm uninstall -k --user 0 com.sonymobile.podcast
pm uninstall -k --user 0 com.sonymobile.sdcardtransfer
pm uninstall -k --user 0 com.sonymobile.sketch
pm uninstall -k --user 0 com.sonymobile.smallbrowser
pm uninstall -k --user 0 com.sonymobile.styleportait.addon.paint
pm uninstall -k --user 0 com.sonymobile.styleportrait.addon.blue
pm uninstall -k --user 0 com.sonymobile.styleportrait.addon.bubble
pm uninstall -k --user 0 com.sonymobile.styleportrait.addon.daily
pm uninstall -k --user 0 com.sonymobile.styleportrait.addon.paint
pm uninstall -k --user 0 com.sonymobile.styleportrait.addon.red
pm uninstall -k --user 0 com.sonymobile.styleportrait.addon.star
pm uninstall -k --user 0 com.sonymobile.styleportrait.addon.sunshine
pm uninstall -k --user 0 com.sonymobile.styleportrait.addon.suntan
pm uninstall -k --user 0 com.sonymobile.support
pm uninstall -k --user 0 com.sonymobile.themes.id001
pm uninstall -k --user 0 com.sonymobile.themes.id002
pm uninstall -k --user 0 com.sonymobile.themes.id003
pm uninstall -k --user 0 com.sonymobile.themes.id004
pm uninstall -k --user 0 com.sonymobile.themes.id006
pm uninstall -k --user 0 com.sonymobile.themes.id007
pm uninstall -k --user 0 com.sonymobile.themes.id008
pm uninstall -k --user 0 com.sonymobile.xperialounge.services
pm uninstall -k --user 0 com.sony.nfx.app.sfrc
pm uninstall -k --user 0 com.sony.snei.np.android.acount
pm uninstall -k --user 0 com.sony.snei.vu
pm uninstall -k --user 0 com.spotify.music
pm uninstall -k --user 0 com.sony.snei.np.android.account
pm uninstall -k --user 0 com.sonyericsson.updatecenter
pm uninstall -k --user 0 com.android.chrome
pm uninstall -k --user 0 com.google.android.talk
pm uninstall -k --user 0 com.android.protips
pm uninstall -k --user 0 com.sonyericsson.xhs
pm uninstall -k --user 0 com.sonyericsson.fmradio
pm uninstall -k --user 0 com.sony.smallapp.app.widget
pm uninstall -k --user 0 com.android.phasebeam
pm uninstall -k --user 0 com.android.dreams.phototable
pm uninstall -k --user 0 com.sonyericsson.extras.liveware
pm uninstall -k --user 0 com.android.email
pm uninstall -k --user 0 com.scee.psxandroid
pm uninstall -k --user 0 com.sonymobile.smallapps.timer
pm uninstall -k --user 0 com.sonymobile.smallapps.calc
pm uninstall -k --user 0 com.sonymobile.xperialounge.services
pm uninstall -k --user 0 com.spotify.music
pm uninstall -k --user 0 com.scee.psxandroid
pm uninstall -k --user 0 com.sonyericsson.android.smartsearch
pm uninstall -k --user 0 com.sonymobile.xperialounge.services
pm uninstall -k --user 0 com.sonymobile.xperiatransfermobile
pm uninstall -k --user 0 com.sonyericsson.xhs
pm uninstall -k --user 0 com.sonyericsson.extras.liveware
pm uninstall -k --user 0 com.sony.snei.np.android.account
Keyboard, you need install other before you uninstall this!
pm uninstall -k --user 0 com.sonyericsson.textinput.uxp
Launchers, you need install other before you uninstall this!
pm uninstall -k --user 0 com.sonyericsson.home
pm uninstall -k --user 0 com.sonymobile.simplehome