[General Questions and Answers] tiagao_extremo:
After trying to root this smartphone, it ended up corrupting some system files. I reinstalled stock rom and this message showed up: TEE key not write, Google key not write:

Using Google i ended up at this thread here in xda:

https://xdaforums.com/general/help/ulefone-power-3s-problem-t3794521

But this method about using adb platform tools didn't worked for me. There's no Factory Mode even when listing all the packages installed. Is there any other recommendation of what i should do? This is actually very annoying? Thanks.

Listed packages:

package:com.android.fmradio

package:com.mediatek.gba

package:com.mediatek.ims

package:com.android.cts.priv.ctsshim

package:com.google.android.youtube

package:com.android.internal.display.cutout.emulation.corner

package:com.google.android.ext.services

package:com.android.internal.display.cutout.emulation.double

package:com.android.providers.telephony

package:com.google.android.googlequicksearchbox

package:com.android.providers.calendar

package:com.android.providers.media

package:com.google.android.onetimeinitializer

package:com.google.android.ext.shared

package:com.mediatek.location.lppe.main

package:com.android.wallpapercropper

package:com.teslacoilsw.launcher

package:com.android.protips

package:com.android.documentsui

package:android.auto_generated_rro__

package:com.android.externalstorage

package:com.mediatek.ygps

package:com.mediatek.simprocessor

package:com.android.htmlviewer

package:com.mediatek.mms.appservice

package:com.android.companiondevicemanager

package:com.android.mms.service

package:com.android.providers.downloads

package:com.google.android.apps.messaging

package:com.adups.fota

package:com.mediatek.engineermode

package:com.android.partnerbrowsercustomizations.example

package:com.qiku.face.unlock

package:com.mediatek.omacp

package:com.google.android.configupdater

package:com.android.soundrecorder

package:com.mediatek.wfo.impl

package:com.android.defcontainer

package:com.android.providers.downloads.ui

package:com.android.vending

package:com.android.pacprocessor

package:com.android.simappdialog

package:com.android.internal.display.cutout.emulation.tall

package:com.android.certinstaller

package:com.android.carrierconfig

package:com.google.android.marvin.talkback

package:com.adups.privacypolicy

package:android

package:com.android.contacts

package:com.android.egg

package:com.android.mtp

package:com.android.nfc

package:com.android.stk

package:com.android.launcher3

package:com.android.backupconfirm

package:com.sprd.screencapture

package:com.android.statementservice

package:com.google.android.gm

package:com.google.android.apps.tachyon

package:com.mediatek.mdmlsample

package:com.android.settings.intelligence

package:com.mediatek.providers.drm

package:com.android.systemui.theme.dark

package:com.google.android.setupwizard

package:com.android.providers.settings

package:com.android.sharedstoragebackup

package:com.mediatek.batterywarning

package:com.google.android.music

package:com.android.printspooler

package:com.android.dreams.basic

package:com.android.se

package:com.android.inputdevices

package:com.google.android.apps.wellbeing

package:com.android.bips

package:com.mediatek

package:com.google.android.apps.nbu.files

package:com.example

package:com.mediatek.duraspeed

package:com.android.musicfx

package:com.google.android.apps.docs

package:com.google.android.apps.maps

package:com.google.android.webview

package:com.android.server.telecom

package:com.google.android.syncadapters.contacts

package:com.android.keychain

package:com.android.camera

package:com.google.android.calculator

package:com.android.chrome

package:com.android.dialer

package:com.google.android.packageinstaller

package:com.google.android.gms

package:com.google.android.gsf

package:com.google.android.ims

package:com.google.android.tts

package:com.google.android.gmsintegration

package:com.android.calllogbackup

package:com.google.android.partnersetup

package:com.google.android.videos

package:com.android.proxyhandler

package:com.google.android.feedback

package:com.google.android.printservice.recommendation

package:com.google.android.apps.photos

package:com.google.android.calendar

package:com.android.managedprovisioning

package:com.mediatek.calendarimporter

package:com.mediatek.thermalmanager

package:com.mediatek.callrecorder

package:com.android.providers.partnerbookmarks

package:com.android.smspush

package:com.mtk.telephony

package:com.android.wallpaper.livepicker

package:com.google.android.gms.policy_sidecar_aps

package:com.google.android.backuptransport

package:com.android.storagemanager

package:com.android.bookmarkprovider

package:com.android.settings

package:com.themonsterit.EngineerStarter

package:com.fineos.superscreenshot

package:com.mediatek.mdmconfig

package:com.mediatek.lbs.em2.ui

package:com.android.cts.ctsshim

package:com.android.vpndialogs

package:com.android.phone

package:com.android.shell

package:com.android.wallpaperbackup

package:com.android.providers.blockednumber

package:com.android.providers.userdictionary

package:com.android.emergency

package:com.android.location.fused

package:com.android.deskclock

package:com.android.systemui

package:com.android.bluetoothmidiservice

package:com.cryptotel.chamelephon

package:com.android.traceur

package:com.mediatek.mtklogger

package:com.mediatek.sensorhub.ui

package:com.android.bluetooth

package:com.android.wallpaperpicker

package:com.android.providers.contacts

package:com.android.captiveportallogin

package:com.google.android.inputmethod.latin

package:com.google.android.apps.restore