[Android Q&A, Help & Troubleshooting] tecknight:
I wouldn't recommend flashing a boot image to this device

I just got done rooting this tablet, only to find that it wouldn't boot the image from flash, only from fastboot.

It was a heck of a ride, but the end left much to be desired.

I can tell you that this image will boot from fastboot and it has root via Magisk:

https://www.androidfilehost.com/?fid=11410932744536984805

You can actually boot it pretty simply.

Just enable adb on your tablet, open up a command prompt on your PC.

Copy the file MagWorkingBoot.img to the folder where your command prompt is running

Type:

adb reboot fastboot

then wait about 5 seconds.

type:

fastboot boot MagWorkingBoot.img

you will see:

Downloading 'boot.img'

(bootloader) Ready to receive: 0x00a225d3 size of data

OKAY [ 0.353s]

booting

OKAY [ 33.438s]

Finished. Total time: 33.808s

Your tablet will boot up. Download and install Magisk Manager from here:

https://github.com/topjohnwu/Magisk/releases/download/manager-v6.0.1/MagiskManager-v6.0.1.apk

Then run Magisk Manager. It should show that Magisk is installed.

Now run any root checker or other app requiring root and Magisk should pop up a dialog asking if you want to grant root to the app. or you can do adb shell and type su + enter

The only problem is that this same image fails to boot when written to the boot partition. I can only assume that the bootloader is not really unlocked despite going thru the whole process .

My tablet is now useless as there is no way I can change the boot partition back. No great loss as the tablet was really slow. I was hoping that by rooting it, I might be able to streamline the build to make it run a bit faster.

However, I recommend an abundance of caution to anyone that wants to flash a new boot image. despite all your testing, it might really disappoint you.

Some useful info:

Build.prop

# begin build properties

# autogenerated by buildinfo.sh

ro.build.id=MMB29M

ro.build.display.id=RCT6973W43-ANDROID6.0-V20-V1.16.50-E04

ro.build.version.incremental=eng.lxz.20161124.145404

ro.build.version.sdk=23

ro.build.version.preview_sdk=0

ro.build.version.codename=REL

ro.build.version.all_codenames=REL

ro.build.version.release=6.0.1

ro.build.version.security_patch=2016-06-01

ro.build.version.base_os=

ro.build.date=2016年 11月 24日 星期四 14:56:52 CST

ro.build.date.utc=1479970612

ro.build.type=user

ro.build.user=lxz

ro.build.host=ubuntu195

ro.build.tags=release-keys

ro.build.flavor=RCT6973W43-user

ro.product.model=RCT6973W43

ro.product.brand=RCA

ro.product.name=RCT6973W43

ro.product.device=sofia3gr

ro.product.board=rk30sdk

# ro.product.cpu.abi and ro.product.cpu.abi2 are obsolete,

# use ro.product.cpu.abilist instead.

ro.product.cpu.abi=x86

ro.product.cpu.abilist=x86,armeabi-v7a,armeabi

ro.product.cpu.abilist32=x86,armeabi-v7a,armeabi

ro.product.cpu.abilist64=

ro.product.manufacturer=Alco

ro.product.locale=en-US

ro.wifi.channels=

ro.board.platform=sofia3gr

# ro.build.product is obsolete; use ro.product.device

ro.build.product=sofia3gr

# Do not try to parse description, fingerprint, or thumbprint

ro.build.description=RCT6973W43-user 6.0.1 MMB29M eng.lxz.20161124.145404 release-keys

ro.build.fingerprint=RCA/RCT6973W43/RCT6973W43:6.0.1/MMB29M/hong08032023:user/release-keys

ro.build.characteristics=tablet

# end build properties

#

# from device/rockchip/sofia3gr/system.prop

#

#

# system.prop

#

#rild.libpath=/system/lib/libreference-ril.so

#rild.libargs=-d /dev/ttyUSB2

# Default ecclist

persist.tegra.nvmmlite = 1

ro.audio.monitorOrientation=true

#NFC

debug.nfc.fw_download=false

debug.nfc.se=false

#add Rockchip properties here

ro.rk.screenoff_time=60000

ro.rk.screenshot_enable=true

ro.rk.homepage_base=http://www.google.com/webhp?client={CID}&source=android-home

ro.rk.install_non_market_apps=false

sys.rkadb.root=0

ro.rk.MassStorage=false

ro.rk.systembar.voiceicon=true

ro.rk.systembar.tabletUI=false

ro.rk.LowBatteryBrightness=false

ro.default.size=100

ro.product.usbfactory=rockchip_usb

ro.factory.tool=0

#force camera API 1

#camera2.portability.force_api=1

#enable camera TAF and FaceDetect ui

persist.camera.debug_ui=1

#enable auto create media_profiles.xml

sys_graphic.cam_hal.at_profiles=true

sys_graphic.cam_normal.yuvout=true

#Sofia properties

ro.sofia_ota=true

#eboda lxz

ro.tether.denied=true

#ro.product.version=1.10.0

#ro.product.ota.host=tablet10.gyrodock.com:2300

ro.product.ota.host2=192.168.0.18:2300

persist.camera.capture_mode=1

persist.camera.preview_full=1

#

# ADDITIONAL_BUILD_PROPERTIES

#

persist.bt.defname=RCT6973W43

ro.product.version=1.16.50

ro.product.ota.host=tablet16.gyrodock.com:2300

ro.sf.lcd_density=160

ro.config.alarm_alert=Oxygen.ogg

ro.config.font_scale=1.08

persist.sys.usb.config=mtp

dalvik.vm.heapstartsize=8m

dalvik.vm.heapgrowthlimit=96m

dalvik.vm.heapsize=174m

dalvik.vm.heaptargetutilization=0.75

dalvik.vm.heapminfree=512k

dalvik.vm.heapmaxfree=2m

ro.config.enable.mtp_opt=true

keyguard.no_require_sim=true

persist.radio.multisim.config=false

persist.modem.disable=true

ro.config.set_language_by_sim=false

persist.service.low_level_freq=1040000

persist.service.boost_freq=1040000

persist.service.brightness=8

media.wfd.video-bitrate=3000000

wifi.interface=wlan0

ro.setupwizard.mode=OPTIONAL

ro.com.google.clientidbase=android-alco

ro.com.google.clientidbase.am=android-alco

ro.com.google.clientidbase.gmm=android-alco

ro.com.google.clientidbase.ms=android-alco

ro.com.google.clientidbase.yt=android-alco

ro.com.google.gmsversion=6.0_r5

ro.frp.pst=/dev/block/platform/soc0/e0000000.noc/by-name/ImcPartID034

ro.rk.gms_cer=true

persist.audio.log=0

drm.service.enabled=true

camera.disable_zsl_mode=1

ro.hwui.texture_cache_size=36.0f

ro.hwui.text_large_cache_width=2048

ro.hwui.text_large_cache_height=1024

ro.sf.hwrotation=180

ro.opengles.version=131072

persist.sys.media.use-awesome=true

debug.hwui.render_dirty_regions=false

sys.hwc.compose_policy=6

sys.hwc.enable=1

persist.sys.ui.hw=false

ro.adb.secure=1

rild.libpath=/system/lib/libril-rk29-dataonly.so

rild.libargs=-d

/dev/ttyACM0

ro.tether.denied=false

persist.sys.strictmode.visual=0

persist.sys.strictmode.disable=1

persist.sys.alarm.fixed=300000

ro.sms.address_enable=false

ro.config.sim_switch=true

ro.config.accessibility=1

ro.config.favourite_channel=1

ro.config.offline_read=1

ro.config.power_off_alarm=1

ro.config.sheduled_power=1

ro.config.speed_dial=1

ro.config.builtin_cdrom=1

ro.config.charge_only=1

ro.config.black_list=0

ro.dalvik.vm.isa.arm=x86

ro.enable.native.bridge.exec=1

ro.sf.lcdc_composer=0

ro.config.ringtone=Ring_Synth_04.ogg

ro.config.notification_sound=pixiedust.ogg

ro.carrier=unknown

persist.sys.dalvik.vm.lib.2=libart

dalvik.vm.isa.x86.variant=silvermont

dalvik.vm.isa.x86.features=default

net.bt.name=Android

dalvik.vm.stack-trace-file=/data/anr/traces.txt

ro.expect.recovery_id=0xf5bbb0762b0719f9bb6c50f6f20bab38e54a76de000000000000000000000000

Partitions:

major minor #blocks name

179 0 15106048 mmcblk0

179 1 8192 mmcblk0p1

179 2 1024 mmcblk0p2

179 3 1024 mmcblk0p3

179 4 1024 mmcblk0p4

179 5 5120 mmcblk0p5

179 6 1024 mmcblk0p6

179 7 4096 mmcblk0p7

179 8 12288 mmcblk0p8

179 9 16384 mmcblk0p9 -> boot

179 10 16384 mmcblk0p10 -> recovery

179 11 23552 mmcblk0p11

179 12 32768 mmcblk0p12

179 13 2048 mmcblk0p13

179 14 8192 mmcblk0p14

179 15 435200 mmcblk0p15

179 16 3407872 mmcblk0p16

179 17 11111424 mmcblk0p17

179 18 2048 mmcblk0p18

179 96 4096 mmcblk0rpmb

179 64 4096 mmcblk0boot1

179 32 4096 mmcblk0boot0

179 128 31166976 mmcblk1

179 129 31150592 mmcblk1p1

By name:

lrwxrwxrwx 1 root root 20 Oct 21 04:37 ImcPartID001 -> /dev/block/mmcblk0p7

lrwxrwxrwx 1 root root 20 Oct 21 04:37 ImcPartID010 -> /dev/block/mmcblk0p4

lrwxrwxrwx 1 root root 21 Oct 21 04:37 ImcPartID013 -> /dev/block/mmcblk0p11

lrwxrwxrwx 1 root root 20 Oct 21 04:37 ImcPartID022 -> /dev/block/mmcblk0p1

lrwxrwxrwx 1 root root 20 Oct 21 04:37 ImcPartID023 -> /dev/block/mmcblk0p2

lrwxrwxrwx 1 root root 20 Oct 21 04:37 ImcPartID024 -> /dev/block/mmcblk0p3

lrwxrwxrwx 1 root root 21 Oct 21 04:37 ImcPartID033 -> /dev/block/mmcblk0p14

lrwxrwxrwx 1 root root 21 Oct 21 04:37 ImcPartID034 -> /dev/block/mmcblk0p13

lrwxrwxrwx 1 root root 21 Oct 21 04:37 ImcPartID068 -> /dev/block/mmcblk0p16

lrwxrwxrwx 1 root root 21 Oct 21 04:37 ImcPartID069 -> /dev/block/mmcblk0p17

lrwxrwxrwx 1 root root 21 Oct 21 04:37 ImcPartID070 -> /dev/block/mmcblk0p15

lrwxrwxrwx 1 root root 20 Oct 21 04:37 ImcPartID071 -> /dev/block/mmcblk0p9

lrwxrwxrwx 1 root root 21 Oct 21 04:37 ImcPartID074 -> /dev/block/mmcblk0p18

lrwxrwxrwx 1 root root 20 Oct 21 04:37 ImcPartID076 -> /dev/block/mmcblk0p5

lrwxrwxrwx 1 root root 20 Oct 21 04:37 ImcPartID115 -> /dev/block/mmcblk0p6

lrwxrwxrwx 1 root root 20 Oct 21 04:37 ImcPartID118 -> /dev/block/mmcblk0p8

lrwxrwxrwx 1 root root 21 Oct 21 04:37 ImcPartID121 -> /dev/block/mmcblk0p10

lrwxrwxrwx 1 root root 21 Oct 21 04:37 ImcPartID122 -> /dev/block/mmcblk0p12

Stock boot image:

https://www.androidfilehost.com/?fid=11410932744536984705

Stock recovery image:

https://www.androidfilehost.com/?fid=11410932744536984706