Cydras, en su Rom personalizada (una pena que ya no continue el projecto, pues era de las mejores que probé) para dejar limpia la Rom, borró todas estas aplicaciones en System\app y es System\privapp:
agnes_service
A-HNSideBar
A-MiuiSigned
A-Miuitimingoff
AppFreezer
BackupRestoreConfirmation
Browser
BugPostbox
ButtonLed
Calculator
Calendar
com.langyuye-setting-1
cpu
DSSettings
Email
Exchange2
FactoryMode
FactoryTest
GallerySyncService
IRTest
Launcher3
LeFreeFlow
LePay
LeShareZL1
LeSo
leSport
LetvAccount
LetvBackupClient
LetvBugServices
LetvCellBroadcastReceiver
LetvCloudService
LetvDebugUtil
LetvEcoProvider
LetvEmojiStore
Letvexcelliance
LetvFanNation
LetvFileManager
LetvFuseWire
LetvGalleryRefocus
LetvLock
LetvNote
LetvPersonalized
LetvPrivacyData
letvroam_qualcomm_bridge
letvroam_softsim
letvroam_virtual
LetvSDKCommonData
LetvStateInfo
LetvStore
LetvSystemReport
LetvTeleExtra
LetvTheme
LetvThemeStore
LetvUsageStatsReporter
LetvUserManual
LetvVideoLeading
LetvVideoPlayer2
LetvVoiceAssistant
LetvWallet
LetvWallpaperOnline
Letvxinghao
Letvztpj
LetvZxing
LeUICalendarImporter
llq
LvrSetupWizard
MIPop
MIUIrebootV1.1
Mmi
ModemTestMode
Music
NetworkLocation_Naidu
RE
Screenmask
SogoInput
stat
Stk
superlive
supersearch
tqrLetv
TrRemoteService
VoiceAssistant
VRAdmin
wdj
WiHDSampleApp
WiHDService
yyzx
zysc
Yo las he borrado en mi rom stock 23s y perfecto.