[Huawei Mate 9 Questions & Answers] danon2:
For demo version will not work.

Only solution what i find is to shut down the demo app.

You must click 2 times retail demo icon then will be ask for password 1122334455 from there you can shut down demo.

On that moment its not possible to remove retail app without root or rebranding change C432 (european) because is system app.

On that moment i find only way to unlock bootloader by fastboot. Unlock key you can get by dc unlocker.

Unfortunetly on that moment i cant flash any another software to that demo model and is no luck to root device or rebrand.

UPDATE:

Is lucky to flash recovery file with finded twrp (for nugat version) and not yet confirmed root.

On that moment i playing with 2 oem info files to make rebrand of device copied by twrp file manager on external sd card

/dev/block/platform/ff3b0000.ufs/by-name/oeminfo

/data/custom.bin

If somebody smarter is hear maybe it will be good if he look in app packages of Mate 9 Demo.

List of packages Mate 9 demo mode:

package:/system/priv-app/CtsShimPrivPrebuilt/CtsShimPrivPrebuilt.apk=com.android.cts.priv.ctsshim

package:/system/app/YouTube/YouTube.apk=com.google.android.youtube

package:/product/app/HwCamera2/HwCamera2.apk=com.huawei.camera

package:/system/priv-app/GoogleExtServices/GoogleExtServices.apk=com.google.android.ext.services

package:/system/app/HwLauncher6/HwLauncher6.apk=com.huawei.android.launcher

package:/product/overlay/Gallery2Overlay/Gallery2Overlay.apk=com.android.gallery3d.overlay

package:/system/priv-app/HwMediaCenter/HwMediaCenter.apk=com.android.mediacenter

package:/system/app/CotaDecompressService/CotaDecompressService.apk=com.huawei.android.CotaDecompressService

package:/system/priv-app/TelephonyProvider/TelephonyProvider.apk=com.android.providers.telephony

package:/system/app/HwInternetAudioService/HwInternetAudioService.apk=com.huawei.internetaudioservice

package:/system/priv-app/Velvet/Velvet.apk=com.google.android.googlequicksearchbox

package:/system/priv-app/CalendarProvider/CalendarProvider.apk=com.android.providers.calendar

package:/data/hw_init/cust/hw/demo/app/HwCloudDrive_Local/HwCloudDrive_Local.apk=com.huawei.hidisk

package:/system/app/HwIAware/HwIAware.apk=com.huawei.iaware

package:/system/app/HwBluetoothImport/HwBluetoothImport.apk=com.huawei.bluetooth

package:/system/priv-app/MediaProvider/MediaProvider.apk=com.android.providers.media

package:/system/app/SwiftKey/SwiftKey.apk=com.touchtype.swiftkey

package:/system/app/HwThemeManager/HwThemeManager.apk=com.huawei.android.thememanager

package:/system/priv-app/HwChrService/HwChrService.apk=com.huawei.android.chr

package:/system/priv-app/HwServiceFramework/HwServiceFramework.apk=com.huawei.android.hsf

package:/system/priv-app/GoogleOneTimeInitializer/GoogleOneTimeInitializer.apk=com.google.android.onetimeinitializer

package:/system/app/GoogleExtShared/GoogleExtShared.apk=com.google.android.ext.shared

package:/data/hw_init/cust/hw/demo/app/AutoInStallAPKFromMcc/AutoInStallAPKFromMcc.apk=com.huawei.autoinstallapkfrommcc

package:/system/priv-app/WallpaperCropper/WallpaperCropper.apk=com.android.wallpapercropper

package:/system/app/HwFloatTasks/HwFloatTasks.apk=com.huawei.android.FloatTasks

package:/system/priv-app/HwMotionRecognition/HwMotionRecognition.apk=com.huawei.motionservice

package:/system/app/SmartcardService/SmartcardService.apk=org.simalliance.openmobileapi.service

package:/system/priv-app/DocumentsUI/DocumentsUI.apk=com.android.documentsui

package:/system/priv-app/ExternalStorageProvider/ExternalStorageProvider.apk=com.android.externalstorage

package:/data/hw_init/cust/hw/demo/app/DisableTodoistReceiver/DisableTodoistReceiver.apk=com.huawei.disabletodoist

package:/system/app/HTMLViewer/HTMLViewer.apk=com.android.htmlviewer

package:/system/priv-app/MmsService/MmsService.apk=com.android.mms.service

package:/system/priv-app/HwWeatherClock/HwWeatherClock.apk=com.huawei.android.totemweather

package:/system/priv-app/DownloadProvider/DownloadProvider.apk=com.android.providers.downloads

package:/data/hw_init/cust/hw/demo/app/HwPhoneService/HwPhoneService.apk=com.huawei.phoneservice

package:/system/priv-app/HwScreenRecorder/HwScreenRecorder.apk=com.huawei.screenrecorder

package:/data/hw_init/cust/hw/demo/app/ChromeHomePage/ChromeHomePage.apk=com.android.partnerbrowsercustomizations.tmobile

package:/system/app/HwVideoEditor/HwVideoEditor.apk=com.huawei.videoeditor

package:/system/app/HwSecurityMgrService/HwSecurityMgrService.apk=com.huawei.securitymgr

package:/system/priv-app/ConfigUpdater/ConfigUpdater.apk=com.google.android.configupdater

package:/system/app/HwSoundRecorder/HwSoundRecorder.apk=com.android.soundrecorder

package:/system/app/iConnect/iConnect.apk=com.huawei.iconnect

package:/system/priv-app/DefaultContainerService/DefaultContainerService.apk=com.android.defcontainer

package:/system/app/DownloadProviderUi/DownloadProviderUi.apk=com.android.providers.downloads.ui

package:/system/priv-app/Phonesky/Phonesky.apk=com.android.vending

package:/system/app/PacProcessor/PacProcessor.apk=com.android.pacprocessor

package:/vendor/app/Mapcon/Mapcon.apk=com.hisi.mapcon

package:/system/framework/framework-res-hwext.apk=androidhwext

package:/system/priv-app/HwVPlayer/HwVPlayer.apk=com.huawei.hwvplayer

package:/system/app/CertInstaller/CertInstaller.apk=com.android.certinstaller

package:/system/priv-app/CarrierConfig/CarrierConfig.apk=com.android.carrierconfig

package:/data/hw_init/cust/hw/demo/app/talkback/talkback.apk=com.google.android.marvin.talkback

package:/system/framework/framework-res.apk=android

package:/system/app/HwIMonitor/HwIMonitor.apk=com.huawei.imonitor

package:/data/hw_init/cust/hw/demo/app/HwID/HwID.apk=com.huawei.hwid

package:/system/priv-app/Contacts/Contacts.apk=com.android.contacts

package:/system/priv-app/Mms/Mms.apk=com.android.mms

package:/system/priv-app/MtpDocumentsProvider/MtpDocumentsProvider.apk=com.android.mtp

package:/system/app/NfcNci_45/NfcNci_45.apk=com.android.nfc

package:/system/app/Stk/Stk.apk=com.android.stk

package:/system/priv-app/BackupRestoreConfirmation/BackupRestoreConfirmation.apk=com.android.backupconfirm

package:/system/app/HwInstantShare/HwInstantShare.apk=com.huawei.android.instantshare

package:/system/app/HwIndexSearchObserverService/HwIndexSearchObserverService.apk=com.huawei.indexsearch.observer

package:/system/app/HwTrustAgent/HwTrustAgent.apk=com.huawei.trustagent

package:/system/priv-app/StatementService/StatementService.apk=com.android.statementservice

package:/system/priv-app/HwIndexSearchService/HwIndexSearchService.apk=com.huawei.indexsearch

package:/system/app/Gmail2/Gmail2.apk=com.google.android.gm

package:/system/app/HwResolver/HwResolver.apk=com.huawei.android.internal.app

package:/product/app/HwFidoAsm/HwFidoAsm.apk=com.huawei.hwasm

package:/data/hw_init/cust/hw/demo/app/OMACP/OMACP.apk=com.huawei.omacp

package:/system/priv-app/Calendar/Calendar.apk=com.android.calendar

package:/system/app/HwWifiproBqeService/HwWifiproBqeService.apk=com.huawei.wifiprobqeservice

package:/system/priv-app/SetupWizard/SetupWizard.apk=com.google.android.setupwizard

package:/system/priv-app/SettingsProvider/SettingsProvider.apk=com.android.providers.settings

package:/system/priv-app/SharedStorageBackup/SharedStorageBackup.apk=com.android.sharedstoragebackup

package:/system/app/Music2/Music2.apk=com.google.android.music

package:/system/app/PrintSpooler/PrintSpooler.apk=com.android.printspooler

package:/product/overlay/frameworkResOverlay.apk=com.android.frameworkres.overlay

package:/system/app/BasicDreams/BasicDreams.apk=com.android.dreams.basic

package:/system/priv-app/InCallUI/InCallUI.apk=com.android.incallui

package:/system/priv-app/HwSystemManager/HwSystemManager.apk=com.huawei.systemmanager

package:/system/priv-app/InputDevices/InputDevices.apk=com.android.inputdevices

package:/system/app/Drive/Drive.apk=com.google.android.apps.docs

package:/system/app/Maps/Maps.apk=com.google.android.apps.maps

package:/system/priv-app/CellBroadcastReceiver/CellBroadcastReceiver.apk=com.android.cellbroadcastreceiver

package:/system/app/WebViewGoogle/WebViewGoogle.apk=com.google.android.webview

package:/system/app/HwMultiScreenShot/HwMultiScreenShot.apk=com.huawei.HwMultiScreenShot

package:/system/app/HwVAssistant/HwVAssistant.apk=com.huawei.vassistant

package:/system/priv-app/Telecom/Telecom.apk=com.android.server.telecom

package:/system/app/GoogleContactsSyncAdapter/GoogleContactsSyncAdapter.apk=com.google.android.syncadapters.contacts

package:/system/priv-app/HwNotePad/HwNotePad.apk=com.example.android.notepad

package:/system/app/KeyChain/KeyChain.apk=com.android.keychain

package:/system/app/HwMagazine/HwMagazine.apk=com.android.keyguard

package:/system/app/Chrome/Chrome.apk=com.android.chrome

package:/system/priv-app/Gallery2/Gallery2.apk=com.android.gallery3d

package:/system/priv-app/GooglePackageInstaller/GooglePackageInstaller.apk=com.google.android.packageinstaller

package:/system/app/WatchSync/WatchSync.apk=com.huawei.watch.sync

package:/system/priv-app/GmsCore/GmsCore.apk=com.google.android.gms

package:/system/priv-app/GoogleServicesFramework/GoogleServicesFramework.apk=com.google.android.gsf

package:/system/app/GoogleTTS/GoogleTTS.apk=com.google.android.tts

package:/system/priv-app/GooglePartnerSetup/GooglePartnerSetup.apk=com.google.android.partnersetup

package:/product/app/HwFidoClient/HwFidoClient.apk=com.huawei.fido.uafclient

package:/system/app/Videos/Videos.apk=com.google.android.videos

package:/system/priv-app/ProxyHandler/ProxyHandler.apk=com.android.proxyhandler

package:/system/app/MirrorShare/MirrorShare.apk=com.huawei.android.mirrorshare

package:/data/hw_init/system/app/ContactsCamcard/ContactsCamcard.apk=com.huawei.contactscamcard

package:/system/priv-app/GoogleFeedback/GoogleFeedback.apk=com.google.android.feedback

package:/system/app/GooglePrintRecommendationService/GooglePrintRecommendationService.apk=com.google.android.printservice.recommendation

package:/system/app/Photos/Photos.apk=com.google.android.apps.photos

package:/system/app/GoogleCalendarSyncAdapter/GoogleCalendarSyncAdapter.apk=com.google.android.syncadapters.calendar

package:/system/priv-app/ManagedProvisioning/ManagedProvisioning.apk=com.android.managedprovisioning

package:/system/app/SwiftKeyFactorySettings/SwiftKeyFactorySettings.apk=com.swiftkey.swiftkeyconfigurator

package:/data/app/com.huawei.hisuite-1/base.apk=com.huawei.hisuite

package:/system/app/PhotoTable/PhotoTable.apk=com.android.dreams.phototable

package:/system/app/HWCardManager/HWCardManager.apk=com.huawei.android.dsdscardmanager

package:/system/app/PartnerBookmarksProvider/PartnerBookmarksProvider.apk=com.android.providers.partnerbookmarks

package:/system/app/HwAps/HwAps.apk=com.huawei.android.hwaps

package:/data/hw_init/cust/hw/demo/app/HwOUC/HwOUC.apk=com.huawei.android.hwouc

package:/system/priv-app/GoogleLoginService/GoogleLoginService.apk=com.google.android.gsf.login

package:/system/app/WAPPushManager/WAPPushManager.apk=com.android.smspush

package:/system/app/HwWiFiDirect/HwWiFiDirect.apk=com.huawei.android.wfdft

package:/system/app/LiveWallpapersPicker/LiveWallpapersPicker.apk=com.android.wallpaper.livepicker

package:/system/app/HwMMITest/HwMMITest.apk=com.huawei.mmitest

package:/system/priv-app/Tag/Tag.apk=com.android.apps.tag

package:/system/app/HwPowerGenieEngine3/HwPowerGenieEngine3.apk=com.huawei.powergenie

package:/product/app/HwSmartShot/HwSmartShot.apk=com.qeexo.smartshot

package:/system/priv-app/GoogleBackupTransport/GoogleBackupTransport.apk=com.google.android.backuptransport

package:/system/app/BookmarkProvider/BookmarkProvider.apk=com.android.bookmarkprovider

package:/system/priv-app/Settings/Settings.apk=com.android.settings

package:/system/app/Calculator/Calculator.apk=com.android.calculator2

package:/system/app/HwProjectMenu/HwProjectMenu.apk=com.huawei.android.projectmenu

package:/system/app/CtsShimPrebuilt/CtsShimPrebuilt.apk=com.android.cts.ctsshim

package:/system/priv-app/GeofenceLocation/GeofenceLocation.apk=com.huawei.geofence

package:/system/priv-app/VpnDialogs/VpnDialogs.apk=com.android.vpndialogs

package:/system/app/HwHealthMidware/HwHealthMidware.apk=com.huawei.ihealth

package:/system/app/HwARService/HwARService.apk=com.huawei.android.location.activityrecognition

package:/system/app/Hangouts/Hangouts.apk=com.google.android.talk

package:/system/priv-app/Email/Email.apk=com.android.email

package:/system/priv-app/TeleService/TeleService.apk=com.android.phone

package:/system/priv-app/Shell/Shell.apk=com.android.shell

package:/system/priv-app/BlockedNumberProvider/BlockedNumberProvider.apk=com.android.providers.blockednumber

package:/system/app/UserDictionaryProvider/UserDictionaryProvider.apk=com.android.providers.userdictionary

package:/data/hw_init/cust/hw/demo/app/PredefinedEapSim/PredefinedEapSim.apk=com.huawei.wifieapsimplmn

package:/system/priv-app/EmergencyInfo/EmergencyInfo.apk=com.android.emergency

package:/system/priv-app/HwScanner/HwScanner.apk=com.huawei.scanner

package:/system/priv-app/FusedLocation/FusedLocation.apk=com.android.location.fused

package:/system/app/HwDeskClock/HwDeskClock.apk=com.android.deskclock

package:/system/priv-app/SystemUI/SystemUI.apk=com.android.systemui

package:/system/priv-app/Exchange2/Exchange2.apk=com.android.exchange

package:/system/app/BluetoothMidiService/BluetoothMidiService.apk=com.android.bluetoothmidiservice

package:/system/app/HwIms/HwIms.apk=com.huawei.ims

package:/system/app/Bluetooth/Bluetooth.apk=com.android.bluetooth

package:/system/priv-app/ContactsProvider/ContactsProvider.apk=com.android.providers.contacts

package:/system/app/CaptivePortalLogin/CaptivePortalLogin.apk=com.android.captiveportallogin

package:/data/hw_init/version/special_cust/MHA-L29/hw/demo/app/Mate9_MTK/Mate9_MTK.apk=com.szdv.mate9

package:/data/hw_init/cust/hw/demo/app/LatinImeGoogle/LatinImeGoogle.apk=com.google.android.inputmethod.latin

UPDATE:

Device is succesfully rebranded and flashed with orginal eu rom.