[Android Q&A, Help & Troubleshooting] zhelan:
following Timo.helfer idea, I extracted the build.prop from system.img, and there might be options to activate so to gain Root or temp root. If anyone can help

# begin common build properties
# autogenerated by build/make/tools/buildinfo_common.sh
ro.system.build.date=Sat Jul 4 22:12:41 HKT 2020
ro.system.build.date.utc=1593871961
ro.system.build.fingerprint=Hisense/HLTE203T/HLTE203T:10/QP1A.190711.020/L1732.6.01.02:user/release-keys
ro.system.build.id=QP1A.190711.020
ro.system.build.tags=release-keys
ro.system.build.type=user
ro.system.build.version.incremental=L1732.6.01.02
ro.system.build.version.release=10
ro.system.build.version.sdk=29
ro.product.system.brand=Hisense
ro.product.system.manufacturer=Hisense
ro.product.system.model=HLTE203T
ro.product.system.device=HLTE203T
ro.product.system.name=HLTE203T
# end common build properties
# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=QP1A.190711.020
ro.build.display.id=QP1A.190711.020 release-keys
ro.build.version.incremental=L1732.6.01.02
ro.build.version.sdk=29
ro.build.version.preview_sdk=0
ro.build.version.preview_sdk_fingerprint=REL
ro.build.version.codename=REL
ro.build.version.all_codenames=REL
ro.build.version.release=10
ro.build.version.security_patch=2020-04-05
ro.build.version.base_os=
ro.build.version.min_supported_target_sdk=23
ro.build.date=Sat Jul 4 22:12:41 HKT 2020
ro.build.date.utc=1593871961
ro.build.type=user
ro.build.user=root
ro.build.host=android-build
ro.build.tags=release-keys
ro.build.flavor=HLTE203T-user
ro.build.system_root_image=false
# ro.product.cpu.abi and ro.product.cpu.abi2 are obsolete,
# use ro.product.cpu.abilist instead.
ro.product.cpu.abi=arm64-v8a
ro.product.cpu.abilist=arm64-v8a,armeabi-v7a,armeabi
ro.product.cpu.abilist32=armeabi-v7a,armeabi
ro.product.cpu.abilist64=arm64-v8a
ro.product.locale=zh-Hans-CN
ro.wifi.channels=
# ro.build.product is obsolete; use ro.product.device
ro.build.product=HLTE203T
# Do not try to parse description or thumbprint
ro.build.description=HLTE203T-user 10 QP1A.190711.020 L1732.6.01.02 release-keys
# end build properties

#
# from device/sprd/sharkl5Pro/HLTE203T/system.prop
#
# Default density config
#ro.sf.lcd_density=320
#ro.sf.lcd_width=54
#ro.sf.lcd_height=96
ro.product.hardware=HLTE203T
ro.vendor.audio.product.hardware=HLTE203T
# Set Opengl ES Version
#ro.opengles.version=196609

# ro.fm.chip.port.UART.androidm=true

# FRP property for pst device
ro.frp.pst=/dev/block/platform/soc/soc:ap-apb/71400000.sdio/by-name/persist

#enable audio nr tuning
ro.vendor.audio_tunning.nr=1

#config dreamcamera begin
persist.sys.cam.battery.flash = 10
persist.sys.cam.3dnr=true
persist.sys.cam.normalhdr=false
persist.sys.cam.beauty.fullfuc=true
persist.sys.cam.sfv.alter=true
persist.sys.cam.filter.version=2
persist.sys.cam.manual.shutter=true
persist.sys.cam.manual.focus=true
persist.sys.cam.wide.8M=true
persist.sys.cam.wide.power=true
#config dreamcamera end

#Enable sdcardfs feature
ro.sys.sdcardfs=true
persist.sys.sdcardfs=force_on

persist.sys.cam.ba.blur.version=6
persist.sys.cam.api.version=0
persist.sys.blending.enable=true
persist.sys.sprd.refocus.bokeh=true

persist.sys.cam.fr.blur.version=1
#eis function
persist.sys.cam.eois.dc.back=false
persist.sys.cam.eois.dc.front=false
persist.sys.cam.eois.dv.back=true
persist.sys.cam.eois.dv.front=false

#enable 3d calibration
persist.sys.3d.calibraion=1
persist.sys.cam3.type=back_bokeh
persist.sys.cam3.multi.cam.id=2

#config lmkd parameters
ro.lmk.use_psi=false
ro.lmk.use_minfree_levels=true

#add for performance
ro.lmk.vmpressurenhanced=true
sys.rotation.animscale=0.5
persist.sys.cam.fast.blur=true

#Enable virtualkeys
qemu.hw.mainkeys=0

#use audio whale hal
ro.audio.whale_hal=true

#audio offload wakelock
ro.audio.offload_wakelock=0

#add for lowpower vowifi
persist.dbg.lowpower_vowifi=0

##########################Below for public################################
#Property info:software version
ro.software.version=L1732.6.03.06.00

#Property info:software internal version
ro.hmct.sw.internal.version=L1732.6.03.06.00

#Property info:hardware version
ro.hardware.version=V1.00

#Property info:modem internal version
ro.hmct.modem.version=FM_BASE_19C_W20.24.3

#Property info:the qualcomm platform's name
ro.hmct.platform.name=sprd

#Property info:internal model for product's name
ro.hmct.internal.model=HLTE203T

#Property info:for Telecom C product
ro.hmct.product.operator=ctfull

#Property info:value for cta test
ro.hmct.cta.test=0

#Property info:value for ct test
ro.hmct.ct.test=0

# add by liangshun for hisense ringtone
ro.config.ringtone=HisenseTune.ogg
ro.config.ringtone0=HisenseTune.ogg
ro.config.ringtone1=HisenseTune.ogg
ro.config.default_message=Message01.ogg
ro.config.default_message0=Message01.ogg
ro.config.default_message1=Message01.ogg
ro.config.notification_sound=Message01.ogg
ro.config.alarm_alert=Spring.ogg

#add for proload_pics
ro.hmct.defaultpics.version=mediaprovider_copy_0
#add lcd_density
ro.sf.lcd_density=320

#add by sunzhe for 3point
ro.hmct.3point.enable=1

#add default timezone
persist.sys.timezone=Asia/Shanghai

# for temperature control
ro.hmct.temp_control_min=47
ro.hmct.temp_control_max=50

# for current limit
ro.current.limit.type=0

# add for secure boot
ro.vendor.keybox.id.value=HLTE203T

#set sms register properties
#ro.hmct.smsregister.enable=1
#ro.hmct.smsregister.product=HS-HLTE203T
#ro.hmct.smsregister.type =ctfull

#set sale statistics properties
ro.hmct.salestatistics=1
#Add by sunzhe;Used by 3point;
ro.hmct.3point.enable=1

### Vision : added by QKD 20180208 for shadowApps add this prop pls let me know.START-@{
ro.hmct.shadowapp.support=true
### END-@}

#add for bmct api key
ro.hmct.bmct.apikey=ab6104c4-2811-4686-8640-b2c861b43447
#add for vision style
ro.hmct.style.vision=true
#Property info:value for TF card support
ro.hmct.TFcard.supported=true
### For low-power mode by wangxufeng @{
ro.config.small_battery=true
### end @}

# add by dudong for network control
persist.radio.primarycard=true
ro.hmct.volte.enabled=1
ro.hmct.volte.operator=cmcc+ct+cu
ro.hmct.volte.dual=1
ro.hmct.operatorswitch=1
persist.sys.hmct.unlock_pin=disable
persist.sys.hmct.sig_optimize=l5d
persist.sys.hmct.nw_optimize=enable
###end @}
### mobile data and roaming switcher config @{
ro.com.android.mobiledata=false
ro.com.android.dataroaming=false
### mobile data and roaming switcher config @}
###BSP:set shutdown timeout to 0
ro.build.shutdown_timeout=0

###PRODUCT:set the default volume @{
ro.config.media_vol_steps=31
ro.config.media_vol_default=25
ro.config.alarm_vol_default=13
ro.config.system_vol_default=11
ro.config.ring_vol_default=11
ro.config.notification_vol_default=8
ro.config.vc_call_vol_default=6
###add end @}

###PRODUCT-hmct add ring volume @{
persist.sys.hmct.callend.vol=70
persist.sys.hmct.dialer.vol=70
persist.sys.hmct.dtmf.vol=70
persist.sys.hmct.fm.vol=1200
persist.sys.hmct.lock.vol=-1
persist.sys.hmct.touch.vol=-5
persist.sys.hmct.volpannel.vol=30
persist.sys.hmct.ringsplit=true
###end @}

# IFAA
persist.sys.ifaa.model=hisense-t610

# buchen add for close power saving mode
persist.sys.pwctl.enable=0

# add by jiangshaoyu for super saving mode
ro.hmct.supersaving.mode=1

###{@
ro.hmct.epd.type=3
###@}

###PRODUCT: typec otg @{
ro.hmct.typec.otg=true
###@}

###PRODUCT:linxinmao add for rcs@{
persist.sys.rcs.enabled=false
###@}

###PRODUCT: for vision share style
persist.hmct.share.style=true

ro.hmct.hmct.model=HLTE203T

#for battery history
ro.hmct.batteryhistory=1

#zhangendi add for applock
ro.hmct.applock.support=true

#for reading mode support
ro.hmct.readingmode.support=1

#wll add for readmode volume
ro.hmct.default.read_volume=3

# hmct add for epd close afbc
persist.vendor.gpu.fbc=0

###add feature for default app settings
ro.hmct.default.app=true
#gby add for readmode volume of qq notification
persist.sys.hmct.readmode.vol1=0
persist.sys.hmct.readmode.vol2=0
persist.sys.hmct.readmode.vol3=-5
persist.sys.hmct.readmode.vol4=-10
persist.sys.hmct.readmode.vol5=-20
persist.sys.hmct.readmode.vol6=-30

###add by wll for hilink audio config @{
ro.hmct.hilink.client.support=1
###@}

###PRODUCT: renyanzhao add for nfc dynamic@{
ro.hmct.nfc.dynamic=true
###@}
###PRODUCT: add the NFC card emulation @{
ro.hmct.nfc.cardemulation=true
###@}
# end of device/sprd/sharkl5Pro/HLTE203T/system.prop

#
# ADDITIONAL_BUILD_PROPERTIES
#
persist.sys.support.vt=true
persist.sys.csvt=false
persist.sys.audio.source=true
keyguard.no_require_sim=true
ro.com.android.dataroaming=false
ro.simlock.unlock.autoshow=1
ro.simlock.unlock.bynv=0
ro.simlock.onekey.lock=0
ro.sprd.displayenhance=true
ro.sprd.nightdisplay.enhance=true
ro.sprd.superresolution=1
ro.sr.displaysize.defaultresolution=0
ro.sr.displaysize.lowresolution=1
ro.sys.pwctl.ultrasaving=0
ro.ifaa.support=true
ro.media.wfd.rgb.enabled=true
ro.media.recoderEIS.enabled=true
ro.wifi.sup_sprd.auto_roam=false
ro.wifi.sup_sprd.coexist_p2p=true
ro.softap.sup_sprd.whitelist=true
ro.softap.sup_sprd.coexist_bt=true
ro.softap.sup_sprd.hidessid=true
ro.softap.sup_sprd.maxstanum=10
ro.softap.sup_sprd.hide5gchannel=true
ro.softap.sup_sprd.support5G=true
ro.wifi.sup_sprd.wapi=true
ro.wcn=enabled
ro.wifi.sup_sprd=true
ro.wifi.sup_sprd.80211w=true
ro.wifi.sup_sprd.check_network=true
ro.wifi.sup_sprd.pocketmode=true
ro.wifi.sup_sprd.wlan_plus=false
ro.softap.sup_sprd=true
ro.softap.sup_sprd.coexist_lte=true
ro.treble.enabled=true
net.bt.name=Android