[General Topics] bbkr:
Overview: here.

I have this phone for few days, so I'm creating this topic as stub for further expansion.

Root:

Follow Magisk general instructions. Boot image from BV9200_EEA-G680-V1.0_20230206V16 ROM is available here (MD5 sum

451c65120b41b40841e7902211db9f7f). If you do not trust my source you can ask BlackView support directly for full ROM link, they are super rooting friendly and usually responds within one day. Kudos to them.

Known issues:

Sound is cut off while using phone. This happens on stock phone app and you need to disable sound enhancement in settings. Or install alternative phone app like ACR Phone.

Sound while playing videos or music sounds weird / oversteered. Just uninstall Harman booster app (see debloating).

No phonecalls recording. This is crucial for some people, unfortunatelly Google decides to make "we know better, you cannot do it, we own your phone because you are too stupid to make your own decisions" move. This is not this phone issue but general Android 12 issue as explained by ACR guys. I had no luck with using ACR Helper. The only solution is to root phone and install Magisk version of ACR helper.

Missing settings. This phone does not use AOSP Android 12 version, and some settings are missing (or lagging behind Android 12 stock implementation). Luckily those are purely cosmetic in most cases.

To disable widget accents following wallpaper color palette use Repainter and disable accents. I don't know ADB command it does under the hood.

There is no setting to disable awful dual line clock on lock screen. Just keep one constant notification present, that will automatically shrink clock to single line. If you know ABD cmd setting responsible for this please let me know.

Debloating over ADB (without root):

I want to emphasize that this is my debloating, it may not suit your needs. For example I use printing from phone so I left print spooler, but I do not use Google Assistant. YMMV. Do not copy-paste it blindly.

BlackView apps (they are surprisingly good, most users will not need to uninstall those unless they are used to apps from other vendors):

pm uninstall --user 0 com.blackview.apkupgrade
pm uninstall --user 0 com.blackview.childmode
pm uninstall --user 0 com.blackview.cplog
pm uninstall --user 0 com.blackview.darkmode.one
pm uninstall --user 0 com.blackview.darkmode.three
pm uninstall --user 0 com.blackview.darkmode.two
pm uninstall --user 0 com.blackview.filetrans
pm uninstall --user 0 com.blackview.focusmode
pm uninstall --user 0 com.blackview.frozenapp
pm uninstall --user 0 com.blackview.fungamecenter
pm uninstall --user 0 com.blackview.gamemode
pm uninstall --user 0 com.blackview.health
pm uninstall --user 0 com.blackview.helper
pm uninstall --user 0 com.blackview.launcher.overlay_framework # Do not remove if you are not replacing launcher
pm uninstall --user 0 com.blackview.leftscreen
pm uninstall --user 0 com.blackview.notebook
pm uninstall --user 0 com.blackview.overlay # # Do not remove if you are not replacing launcher
pm uninstall --user 0 com.blackview.radioservice
pm uninstall --user 0 com.blackview.systemmanager
pm uninstall --user 0 com.blackview.theme.blooming
pm uninstall --user 0 com.blackview.theme.bv9200
pm uninstall --user 0 com.blackview.theme.config
pm uninstall --user 0 com.blackview.theme.glossy
pm uninstall --user 0 com.blackview.theme.vortex
pm uninstall --user 0 com.blackview.tool
pm uninstall --user 0 com.blackview.userfeedback
pm uninstall --user 0 com.blackview.wallpaper
pm uninstall --user 0 com.blackview.wallpaperpicker
pm uninstall --user 0 com.blackview.wallpaperpicker.overlay
pm uninstall --user 0 com.blackview.weather

Warning - if you use another launcher you still cannot uninstall com.blackview.launcher package. It will break "recent apps" view.

Audio:

pm uninstall --user 0 harman.audioefx

This was causing audio oversteer in my case, not needed for audio to work.

HCT mysterious stuff:

pm uninstall --user 0 com.hct.factorymode
pm uninstall --user 0 com.hct.sensorcalibration
pm uninstall --user 0 com.hct.smarttouch
pm uninstall --user 0 com.hct.superscreen
pm uninstall --user 0 com.hct.theme.smart
pm uninstall --user 0 com.hct.userguide
pm uninstall --user 0 cn.sh.hct.hcttheme
pm uninstall --user 0 com.magiear.handsfree.assistant

I found very little on those apps. Looks like some kind of producer provisioning. Removing them does not affect phone working. Like you can still do factory reset or calibrate sensors.

Mediatek stock apps:

pm uninstall --user 0 com.mediatek.callrecorder
pm uninstall --user 0 com.mediatek.videoplayer
pm uninstall --user 0 com.mediatek.voicecommand
pm uninstall --user 0 com.mediatek.voiceunlock

Mediatek provides drivers + apps combo for their chipsets. Some of those apps are not needed or their functionality is duplicated by other apps.

Android / Google:

pm uninstall --user 0 com.google.android.apps.docs # Google Drive
pm uninstall --user 0 com.google.android.apps.fitness # Google Fitness / health data
pm uninstall --user 0 com.google.android.apps.googleassistant # Google Assistant
pm uninstall --user 0 com.google.android.apps.nbu.files # Buit-in file manager (I use Solid Explorer)
pm uninstall --user 0 com.google.android.apps.photos # Google Photos, I prefer much faster Google Gallery
pm uninstall --user 0 com.google.android.apps.setupwizard.searchselector # First setup stuff
pm uninstall --user 0 com.google.android.apps.tachyon #Video calls, does not affect making vido calls in other apps
pm uninstall --user 0 com.google.android.apps.translate # Google translate
pm uninstall --user 0 com.google.android.apps.wellbeing # I'm fine, thank you
pm uninstall --user 0 com.google.android.apps.youtube.music # Music player (I use VLC)
pm uninstall --user 0 com.google.android.feedback # Your complaint will not be heard anyway :)
pm uninstall --user 0 com.google.android.marvin.talkback # Accessibility service for blind people
pm uninstall --user 0 com.google.android.partnersetup # First init setup
pm uninstall --user 0 com.google.android.projection.gearhead # I think this is part of Android Auto, not compatible with my ancient Dodge
pm uninstall --user 0 com.google.android.setupwizard # First init setup
pm uninstall --user 0 com.google.android.videos # Google Videos
pm uninstall --user 0 com.google.android.youtube # I use Youtube from browser
pm uninstall --user 0 com.google.android.googlequicksearchbox # I use searching from browser

pm uninstall --user 0 com.android.bookmarkprovider # System wide bookmarks, not really needed if you do not use Chrome
pm uninstall --user 0 com.android.calllogbackup # Backup calls, I use non stock phone app from ACR
pm uninstall --user 0 com.android.cellbroadcastreceiver # Alerts about dangers like earthquakes. Not supported in my country.
pm uninstall --user 0 com.android.companiondevicemanager # ?
pm uninstall --user 0 com.android.cts.ctsshim # This is for developers when testing app compatibility
pm uninstall --user 0 com.android.cts.priv.ctsshim # Same ^
pm uninstall --user 0 com.android.dreams.basic # I dream of Google allowing to record calls without stupid arguments
pm uninstall --user 0 com.android.egg # Hidden picture if you click on android version few times in settings, crucial :)
pm uninstall --user 0 com.android.emergency # Allows to set up emergency info
pm uninstall --user 0 com.android.fmradio # Radio. Weird, because this phone has no headphone jack required for antenna :)
pm uninstall --user 0 com.android.htmlviewer # ?
pm uninstall --user 0 com.android.localtransport # Allows apps to talk to each other. Looks scarry but I didn't observe any functionality broken after removing it.
pm uninstall --user 0 com.android.managedprovisioning # Needed if your company owns the phone
pm uninstall --user 0 com.android.mms.service # Ancient stuff, old people used it for sending nudes
pm uninstall --user 0 com.android.partnerbrowsercustomizations.example # First init setup
pm uninstall --user 0 com.android.providers.partnerbookmarks # First init setup
pm uninstall --user 0 com.android.qr_codescan # Not needed as separate app, every browser can read QRs
pm uninstall --user 0 com.android.soundrecorder # Sound Recorder, I do not use it
pm uninstall --user 0 com.android.traceur # Tracing system behavior in Developer options
pm uninstall --user 0 com.android.wallpaper.livepicker # Live wallapers, excellent battery burner
pm uninstall --user 0 com.android.wallpaperbackup # Not needed
pm uninstall --user 0 com.android.musicfx # Sound equalizer, removing does not affect audio.

Other

pm uninstall --user 0 cn.wps.moffice_eng # WPS office, a lot of permissions needed and long history of questionable privacy. I use LibreOffice.

After debloating and installing Nova launcher free memory after startup increased from 2.4 to 3.7GB. Average CPU usage dropped by 75% (Google Assistant was real resource hog here and surprisingly com.mediatek.voiceunlock service was second). I do not have exact battery graphs before and after debloating, but battery life is great, drops less that 20% per day on medium usage.