[ROM][UNOFFICIAL][7.1.2][tb8703f/x/r/n] LineageOS 14.1 for Lenovo TAB 3 8 plus P8

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RomainD2

Senior Member
Sep 8, 2014
143
10
Hi,

In order to prepare before receving my tablet (Lenovo P8 LTE version), I would like to be sure of the process to install this ROM :

1/ I need to root the Lenovo P8 with windows with the following topic, using the "4G TB-8703X model" TWRP version : https://forum.xda-developers.com/general/general/twrp-lenovo-p8-tb-8703f-tb-8703x-t3689442
2/ Install Special TWRP build (To install and boot any custom roms and to boot it after installing mods that change boot partitition like Magisk please use this TWRP: 2018-08-25) Is it the same version for WIFI and LTE version ?
3/ Backup the Stock ROM with TWRP in case of problem
4/ Wipe System, Vendor, Dalvik, Cache, Data
5/ Install zip : lineage-14.1-20180804-UNOFFICIAL-TB8703.zip
6/ Install Gapps from open Gapps ? 7.1, x86, stock ?
7/ Install Magisk ? Which version ?

Hope this ROM is also compatible with the LTE version of Lenovo P8 ?

Thanks for your help!
 
Hi,

In order to prepare before receving my tablet (Lenovo P8 LTE version), I would like to be sure of the process to install this ROM :

1/ I need to root the Lenovo P8 with windows with the following topic, using the "4G TB-8703X model" TWRP version : https://forum.xda-developers.com/general/general/twrp-lenovo-p8-tb-8703f-tb-8703x-t3689442
2/ Install Special TWRP build (To install and boot any custom roms and to boot it after installing mods that change boot partitition like Magisk please use this TWRP: 2018-08-25) Is it the same version for WIFI and LTE version ?
3/ Backup the Stock ROM with TWRP in case of problem
4/ Wipe System, Vendor, Dalvik, Cache, Data
5/ Install zip : lineage-14.1-20180804-UNOFFICIAL-TB8703.zip
6/ Install Gapps from open Gapps ? 7.1, x86, stock ?
7/ Install Magisk ? Which version ?



_1) no need to root (anyway) your device... For install this rom you have to install twrp via QFIL&from twrp Install Rom/gapps/magisk or su..
2) same twrp ...take the newest .img from OP (needs bootsign.img version of twrp...this version allows to boot with locked BT)
3)stock rom not needed backup...If you have problem (brick,bootloop etc) just flash stock rom via QFIL-QPST > [ https://forum.xda-developers.com/android/development/lenovo-p8-tb-8703f-wifi-how-to-flash-t3720621 ] *If you do not know first how to reset your device to the factory mode if an error happen,dont'do it ! is a risk
4) cache/dalvik/system/data (no Internal!) ...no need to format data when coming from stock rom
5) take the newest zip Linos14.1 from OP
6) you need gapps ARMx64 7.1 : https://opengapps.org/ (Nano is enough/or that package you want..no needed big package!)
7) whatever you want (magisk or supersu) ...the last version of magisk : https://forum.xda-developers.com/apps/magisk/beta-magisk-v13-0-0980cb6-t3618589
https://forum.xda-developers.com/apps/magisk/official-magisk-v7-universal-systemless-t3473445
_supersu V2.82 sr5 : https://forum.xda-developers.com/apps/supersu/2014-09-02-supersu-v2-05-t2868133
_supports devices: f/x/r/n

_*Read again carefully the OP & look at the screenshoots...for example: " ROM installation process changed. Now works with encrypted /data partition. Please use new TWRP build with Boot Sign function"
sry for english
 
Last edited:
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k3m3x

Member
Jan 2, 2018
8
0
I want to move from the custom ROM to the official ROM, can I install it from twrp? Because my tab condition is rooted and already installed twrp..
 

lookaszpl

New member
Sep 11, 2018
1
0
Hello,

I installed TWRP with this tutorial:
https://forum.xda-developers.com/general/general/twrp-lenovo-p8-tb-8703f-tb-8703x-t3689442

and there is different version of TWRP than here (my mistake).

At this moment:
- I have installed TWRP 3.1.1-0820
- I installed LineageOS 14.1 using TWRP 3.1.1
- after tablet start I see logo Lenovo through 1 second and next black screen
- I have access to TWRP
- When I connect tablet to PC I see Qualcomm HS-USB Diagnostics 900E

What I should do next to unbrick my tablet? I'm newbie :(

---
Update:
I can run device in 9008 mode (using TWRP and 9008 mode reboot). Can I edit "rawprogram0.xml" as below:

<?xml version="1.0"?>

-<data>

<!--NOTE: This is an ** Autogenerated file **-->


<!--NOTE: Sector size is 512bytes-->


<program start_sector="445088" start_byte_hex="0xd954000" sparse="false" size_in_KB="65536.0" physical_partition_number="0" num_partition_sectors="131072" label="recovery" filename="twrp-tb8703-3.2.1-20180825-bootsign.img" file_sector_offset="0" SECTOR_SIZE_IN_BYTES="512"/>

<program start_sector="7536640" start_byte_hex="0xe6000000L" sparse="false" size_in_KB="1024.0" physical_partition_number="0" num_partition_sectors="2048" label="misc" filename="misc.bin" file_sector_offset="0" SECTOR_SIZE_IN_BYTES="512"/>

</data>

and send proper TWRP image to device? I prefer ask than brick device totally.
 
Last edited:

wbn1

Senior Member
Nov 29, 2016
78
55
You need the special twrp. Link is in the first post. It has an option to sign boot. I think it's in Advanced menu of that twrp.
 
Hello,

I installed TWRP with this tutorial:
https://forum.xda-developers.com/general/general/twrp-lenovo-p8-tb-8703f-tb-8703x-t3689442

and there is different version of TWRP than here (my mistake).

At this moment:
- I have installed TWRP 3.1.1-0820
- I installed LineageOS 14.1 using TWRP 3.1.1
- after tablet start I see logo Lenovo through 1 second and next black screen
- I have access to TWRP
- When I connect tablet to PC I see Qualcomm HS-USB Diagnostics 900E

What I should do next to unbrick my tablet? I'm newbie :(

---
Update:
I can run device in 9008 mode (using TWRP and 9008 mode reboot). Can I edit "rawprogram0.xml" as below:



and send proper TWRP image to device? I prefer ask than brick device totally.


1) _First than all, take the new TWRP 3.2.1 bootsign.img from OP : > Reboot On Recovery > Install> Install image> Select TWRP 3.2.1 bootsign.img > Select "Recovery" as partition to flash ... Reboot to recovery to use new one 3.2.1 (if you are lucky!) :)

2)_ if the device does not start-boot : How to Flash Stock Rom - Unbrick Via QFIL >
https://forum.xda-developers.com/android/development/lenovo-p8-tb-8703f-wifi-how-to-flash-t3720621
 
Last edited:

aluke

Senior Member
Nov 30, 2008
142
30
Spain
Hello,

I installed TWRP with this tutorial:
https://forum.xda-developers.com/general/general/twrp-lenovo-p8-tb-8703f-tb-8703x-t3689442

and there is different version of TWRP than here (my mistake).

At this moment:
- I have installed TWRP 3.1.1-0820
- I installed LineageOS 14.1 using TWRP 3.1.1
- after tablet start I see logo Lenovo through 1 second and next black screen
- I have access to TWRP
- When I connect tablet to PC I see Qualcomm HS-USB Diagnostics 900E

What I should do next to unbrick my tablet? I'm newbie :(

---
Update:
I can run device in 9008 mode (using TWRP and 9008 mode reboot). Can I edit "rawprogram0.xml" as below:



and send proper TWRP image to device? I prefer ask than brick device totally.

Do you need ALWAYS to make RMforceencrypt (with twrp 3.1.1) or Signboot (with last twrp 3.2.1) after to flash anything.
If not, ROM cannot to boot. The reason is because we have locked bootloader.

So go to twrp and do it. After that, reboot system.
You can find this option in advanced button, on twrp.
 
Last edited:
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marozsas

New member
Feb 8, 2011
3
0
I´ve followed the steps but no luck. Please help !

How to install
To install this you have to install TWRP using by QFIL utility, follow this instruction: https://forum.xda-developers.com/general/general/twrp-lenovo-p8-tb-8703f-tb-8703x-t3689442/post76277192

Special TWRP build
To install and boot any custom roms and to boot it after installing mods that change boot partitition like Magisk please use this TWRP:
2018-08-25
  • Fixed long time to wakeup screen in TWRP
  • Added NTFS filesystem for sdcards
mailru: twrp-tb8703-3.2.1-20180825-bootsign.img
gdrive: twrp-tb8703-3.2.1-20180825-bootsign.img

Hi there !

I´ve followed the 14 steps (https://forum.xda-developers.com/general/general/twrp-lenovo-p8-tb-8703f-tb-8703x-t3689442) to install the chinese TWRP and root the device, without any problems.
After the android boot, I´ve installed a root checker to double check everything was ok. It was.
Then I´ve boot into twrp again (the chinese version) to install the TWRP 3.2.1 (twrp-tb8703-3.2.1-20180825-bootsign.img) as stated in the post .
No problems here too.

Then, booted again this time in TWRP 3.2.1 to install lineage and gapps.
Went to advanced wipe and select to wipe: DATA, SYSTEM and CACHE
Then, install zip lineage ROM lineage-14.1-20180804-UNOFFICIAL-TB8703.zip (https://cloud.mail.ru/public/KMkK/b7Nht7ZTm) and zip gapps 7.1 arm64 .
Everything looks ok here. The installation process ended without any error messages.

The problem is when I reboot to system, it blinks the lenovo logo and the screen goes black and nothing happens (maybe it is powered off).

Currently I have access to TWRP 3.2.1 throught the recovery menu;
What I have done wrong, if any ?
What I can to to fix ?

I appreciate any ideas and comments.

best regards,
 

Jinkkys

Member
Sep 24, 2018
5
1
Thank you for your work.

I would like to install dolby atmos, I tried twrp and magisk installer, but after installation I do not see any new dolby icon. I uninstalled fx audio from titanium before installing dolby atmos.
 

aluke

Senior Member
Nov 30, 2008
142
30
Spain
Thank you for your work.

I would like to install dolby atmos, I tried twrp and magisk installer, but after installation I do not see any new dolby icon. I uninstalled fx audio from titanium before installing dolby atmos.

You dont need any root for to install dolby.
Sometimes dont show the icon, so only flash again dolby and it will appears.
And it is not necessary to uninstall FX audio. Dolby works anyway.
 
Last edited:

pinkassek

Member
Dec 30, 2014
7
0
How install special TWRP build from link on 1 post using by QFIL utility? In link there is only IMG file. QFIL needs mbn file and xml file...
 
How install special TWRP build from link on 1 post using by QFIL utility? In link there is only IMG file. QFIL needs mbn file and xml file...


Νeeded more info for your device...
_you have already installed old version twrp?? If yes, you can flash new version twrp 3.2.1 bootsign.img / Reboot on recovery > Install> Install image> Select TWRP 3.2.1 bootsign.img > Select "Recovery" as partition to flash...Reboot to recovery to use new on...(don't forget to use "RMforceencryp" button from old recovery!)
_If you do not have custom recovery on your device Read here how : https://forum.xda-developers.com/general/general/twrp-lenovo-p8-tb-8703f-tb-8703x-t3689442

if you had read the previous positions,all these are described
sry for english
 

pedroalvesjor

New member
Aug 28, 2015
3
0
Please someone help me !!!

please help me: I followed all the steps of this tutorial, from start to finish, I installed the ROM lineage on the device, but at boot time, the tablet does not boot. The LINEAGE logo appears, it goes to Lineage's home screen, but after that the device switches itself off. I already pressed the BOOT button after passing the ROM, but still the system does not boot. Please can anyone help me with any suggestions ???????
 

highwaystar_ru

Senior Member
Sep 17, 2016
342
2,358
please help me: I followed all the steps of this tutorial, from start to finish, I installed the ROM lineage on the device, but at boot time, the tablet does not boot. The LINEAGE logo appears, it goes to Lineage's home screen, but after that the device switches itself off. I already pressed the BOOT button after passing the ROM, but still the system does not boot. Please can anyone help me with any suggestions ???????

It sounds like you wiped /persist partition. You have to restore by flashing full stock ROM by qfil utility.
 
please help me: I followed all the steps of this tutorial, from start to finish, I installed the ROM lineage on the device, but at boot time, the tablet does not boot. The LINEAGE logo appears, it goes to Lineage's home screen, but after that the device switches itself off. I already pressed the BOOT button after passing the ROM, but still the system does not boot. Please can anyone help me with any suggestions ???????


_you have to flash stock rom via QFIL,to restore your device in factory condition
(take stock rom for your model & flash it)
https://forum.xda-developers.com/android/development/lenovo-p8-tb-8703f-wifi-how-to-flash-t3720621
 
Last edited:

tweakradje

Senior Member
@highwaystar_ru Is it possible to fix this issue? I have searched and it is known problem with kernel.
Logcat:

Code:
 SchedPolicy: add_tid_to_cgroup failed; fd=-1
 ActivityManager: Failed setting process group of 2646 to 1
 System.err: java.lang.IllegalArgumentException: Invalid argument: 2646
 System.err:    at android.os.Process.setProcessGroup(Native Method)
 System.err:    at com.android.server.am.ActivityManagerService.applyOomAdjLocked(ActivityManagerService.java:20799)
 System.err:    at com.android.server.am.ActivityManagerService.updateOomAdjLocked(ActivityManagerService.java:21147)
 System.err:    at com.android.server.am.ActivityManagerService.updateOomAdjLocked(ActivityManagerService.java:21225)
 System.err:    at com.android.server.am.BroadcastQueue.deliverToRegisteredReceiverLocked(BroadcastQueue.java:655)
 System.err:    at com.android.server.am.BroadcastQueue.processNextBroadcast(BroadcastQueue.java:953)
 System.err:    at com.android.server.am.ActivityManagerService.finishReceiver(ActivityManagerService.java:18942)
 System.err:    at android.app.ActivityManagerNative.onTransact(ActivityManagerNative.java:529)
 System.err:    at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:2984)
 System.err:    at android.os.Binder.execTransact(Binder.java:565)
 SchedPolicy: add_tid_to_cgroup failed; fd=-1
 ActivityManager: Failed setting process group of 2646 to 0
 System.err: java.lang.IllegalArgumentException: Invalid argument: 2646
 System.err:    at android.os.Process.setProcessGroup(Native Method)
 System.err:    at com.android.server.am.ActivityManagerService.applyOomAdjLocked(ActivityManagerService.java:20799)
 System.err:    at com.android.server.am.ActivityManagerService.updateOomAdjLocked(ActivityManagerService.java:21402)
 System.err:    at com.android.server.am.BroadcastQueue.processNextBroadcast(BroadcastQueue.java:834)
 System.err:    at com.android.server.am.ActivityManagerService.finishReceiver(ActivityManagerService.java:18942)
 System.err:    at android.app.ActivityManagerNative.onTransact(ActivityManagerNative.java:529)
 System.err:    at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:2984)
 System.err:    at android.os.Binder.execTransact(Binder.java:565)
 wpa_supplicant: wpa_driver_nl80211_driver_cmd SETSUSPENDMODE 0 len = 0, 4096

Can you build new kernel/boot.img?

Big Thanks
 

gmincca

Senior Member
Nov 28, 2012
144
13
http%3A%2F%2Ffiles.paulfasola.fr%2FCyanogenMod%2FLineageOS.png


Code:
/*
 * I'm not responsible for bricked devices, dead SD cards, thermonuclear war, or you getting fired because the alarm app failed (like it did for me...). 
 * Please do some research if you have any concerns about features included in the products you find here before flashing it! 
 * YOU are choosing to make these modifications, and if you point the finger at me for messing up your device, I will laugh at you. 
 * Your warranty will be void if you tamper with any part of your device / software.
 * Same statement for XDA.
 */

LineageOS is a free, community built, aftermarket firmware distribution of Android 8 (oreo), which is designed to increase performance and reliability over stock Android for your device.

LineageOS is based on the Android Open Source Project with extra contributions from many people within the Android community. It can be used without any need to have any Google application installed. Linked below is a package that has come from another Android project that restore the Google parts. LineageOS does still include various hardware-specific code, which is also slowly being open-sourced anyway.

All the source code for LineageOS is available in the LineageOS Github repo. And if you would like to contribute to LineageOS, please visit out Gerrit Code Review.


What works:
Calls/SMS/Mobile data
Wifi
Bluetooth
GPS
Camera
Audio
FM radio
Torchlight
LED
USB and WLAN tethering

Broken
You tell me

Source code:
device : https://github.com/HighwayStar/android_device_lenovo_TB8703
kernel: https://github.com/HighwayStar/android_kernel_lenovo_msm8953/tree/cm-14.1-common
vendor: https://github.com/HighwayStar/android_vendor_lenovo_TB8703

2018-08-04
  • Its probably final build for Lineage 14.1, next will be 15.1. Some final preparations done:
  • Removed some unused blobs
  • Fixed grayish colors in HAL3 camera app lik Google Camera mods.
  • LineageOS code updated
  • Device tree switched to subtreeway to include some needed caf modules like camera., gps, ipa. If you use sources please note cm-14.1 branch force pushed. Old branch saved to cm-14.1-backup
  • ROM installation process changed. Now works with encrypted /data partition. No need to format data when coming from stock ROM. Please use new TWRP build with Boot Sign function, download below..
mailru: lineage-14.1-20180804-UNOFFICIAL-TB8703.zip
gdrive: lineage-14.1-20180804-UNOFFICIAL-TB8703.zip

Previous version:

2018-06-18
  • Fixed LED notification with apps with blue and green background, including battery cahrging indication > 90%
  • Updated Lineage code
mailru: lineage-14.1-20180618-UNOFFICIAL-TB8703.zip
gdrive: lineage-14.1-20180618-UNOFFICIAL-TB8703.zip

Download
2018-06-11
  • Fixed wifi and USB tethering (modem mode)
  • Fixed video playback, including camera video
  • Enabled wifi display (miracast).
  • Updated Lineage code
mailru: lineage-14.1-20180611-UNOFFICIAL-TB8703.zip
gdrive: lineage-14.1-20180611-UNOFFICIAL-TB8703.zip

2018-05-28
Fixed notification LED
Fixed backlight becomes darker on screen has dark content
Show TB-8703F in About Phone for WiFi tablet version
Complete disabled CapSensor, because it causing random touches, when you hold tablet

mailru lineage-14.1-20180528-UNOFFICIAL-TB8703.zip
gdrive lineage-14.1-20180528-UNOFFICIAL-TB8703.zip

2018-05-26
[*] first release
mailru: lineage-14.1-20180526-UNOFFICIAL-TB8703.zip
gdrive: lineage-14.1-20180526-UNOFFICIAL-TB8703.zip


How to install
To install this you have to install TWRP using by QFIL utility, follow this instruction: https://forum.xda-developers.com/general/general/twrp-lenovo-p8-tb-8703f-tb-8703x-t3689442/post76277192

Special TWRP build
To install and boot any custom roms and to boot it after installing mods that change boot partitition like Magisk please use this TWRP:
2018-08-25
  • Fixed long time to wakeup screen in TWRP
  • Added NTFS filesystem for sdcards
mailru: twrp-tb8703-3.2.1-20180825-bootsign.img
gdrive: twrp-tb8703-3.2.1-20180825-bootsign.img

Previous version

This TWRP build has special function Sign boot whihc you have to click after install new version of ROM or mod like Magisk. It will append stock boot signature to your boot partition. This allows to boot with locked bootloader.
TWRP with Boot Sign function screenshots:

Fortunately you dont need to unlock bootloader, because not every Lenovo tab can be unlocked. Custom kernel and ROM can be runned by appending boot.sig signature extracted from stock rom to boot.img like
Code:
cat boot.img boot.sig > boot-signed.img
It still cant be loaded by fastboot, but you always can flash it from TWRP. You can get boot.sig in my repo https://github.com/HighwayStar/android_device_lenovo_TB8703/blob/cm-14.1/twrp/recovery/root/boot.sig

XDA:DevDB Information
[ROM][UNOFFICIAL][7.1.2][tb8703f/x/r/n] LineageOS 14.1 for Lenovo TAB 3 8 plus P8, ROM for the Lenovo Thinkpad Tablet

Contributors
highwaystar_ru
Source Code: https://github.com/HighwayStar/android_kernel_lenovo_msm8953/tree/cm-14.1-common

ROM OS Version: 7.x Nougat
ROM Kernel: Linux 3.10.x
Based On: LineageOs

Version Information
Status: Testing

Created 2018-05-27
Last Updated 2018-08-25

Hi,

This could be useful as I have a tb-8703x that appears to have USA mobile bands which won't work with my sim card in the UK. So my question is simply by flashing Lineage OS will it incude updating the supported bands to allow a UK sim card to function?? If so then I'm in business, if not then I won't waste my time.

Thanks
 

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  • 43
    http%3A%2F%2Ffiles.paulfasola.fr%2FCyanogenMod%2FLineageOS.png


    Code:
    /*
     * I'm not responsible for bricked devices, dead SD cards, thermonuclear war, or you getting fired because the alarm app failed (like it did for me...). 
     * Please do some research if you have any concerns about features included in the products you find here before flashing it! 
     * YOU are choosing to make these modifications, and if you point the finger at me for messing up your device, I will laugh at you. 
     * Your warranty will be void if you tamper with any part of your device / software.
     * Same statement for XDA.
     */

    LineageOS is a free, community built, aftermarket firmware distribution of Android 8 (oreo), which is designed to increase performance and reliability over stock Android for your device.

    LineageOS is based on the Android Open Source Project with extra contributions from many people within the Android community. It can be used without any need to have any Google application installed. Linked below is a package that has come from another Android project that restore the Google parts. LineageOS does still include various hardware-specific code, which is also slowly being open-sourced anyway.

    All the source code for LineageOS is available in the LineageOS Github repo. And if you would like to contribute to LineageOS, please visit out Gerrit Code Review.


    What works:
    Calls/SMS/Mobile data
    Wifi
    Bluetooth
    GPS
    Camera
    Audio
    FM radio
    Torchlight
    LED
    USB and WLAN tethering

    Broken
    You tell me

    Source code:
    device : https://github.com/HighwayStar/android_device_lenovo_TB8703
    kernel: https://github.com/HighwayStar/android_kernel_lenovo_msm8953/tree/cm-14.1-common
    vendor: https://github.com/HighwayStar/android_vendor_lenovo_TB8703

    2018-08-04
    • Its probably final build for Lineage 14.1, next will be 15.1. Some final preparations done:
    • Removed some unused blobs
    • Fixed grayish colors in HAL3 camera app lik Google Camera mods.
    • LineageOS code updated
    • Device tree switched to subtreeway to include some needed caf modules like camera., gps, ipa. If you use sources please note cm-14.1 branch force pushed. Old branch saved to cm-14.1-backup
    • ROM installation process changed. Now works with encrypted /data partition. No need to format data when coming from stock ROM. Please use new TWRP build with Boot Sign function, download below..
    mailru: lineage-14.1-20180804-UNOFFICIAL-TB8703.zip
    gdrive: lineage-14.1-20180804-UNOFFICIAL-TB8703.zip

    Previous version:

    2018-06-18
    • Fixed LED notification with apps with blue and green background, including battery cahrging indication > 90%
    • Updated Lineage code
    mailru: lineage-14.1-20180618-UNOFFICIAL-TB8703.zip
    gdrive: lineage-14.1-20180618-UNOFFICIAL-TB8703.zip

    Download
    2018-06-11
    • Fixed wifi and USB tethering (modem mode)
    • Fixed video playback, including camera video
    • Enabled wifi display (miracast).
    • Updated Lineage code
    mailru: lineage-14.1-20180611-UNOFFICIAL-TB8703.zip
    gdrive: lineage-14.1-20180611-UNOFFICIAL-TB8703.zip

    2018-05-28
    Fixed notification LED
    Fixed backlight becomes darker on screen has dark content
    Show TB-8703F in About Phone for WiFi tablet version
    Complete disabled CapSensor, because it causing random touches, when you hold tablet

    mailru lineage-14.1-20180528-UNOFFICIAL-TB8703.zip
    gdrive lineage-14.1-20180528-UNOFFICIAL-TB8703.zip

    2018-05-26
    [*] first release
    mailru: lineage-14.1-20180526-UNOFFICIAL-TB8703.zip
    gdrive: lineage-14.1-20180526-UNOFFICIAL-TB8703.zip


    How to install
    To install this you have to install TWRP using by QFIL utility, follow this instruction: https://forum.xda-developers.com/general/general/twrp-lenovo-p8-tb-8703f-tb-8703x-t3689442/post76277192

    Special TWRP build
    To install and boot any custom roms and to boot it after installing mods that change boot partitition like Magisk please use this TWRP:
    2018-08-25
    • Fixed long time to wakeup screen in TWRP
    • Added NTFS filesystem for sdcards
    mailru: twrp-tb8703-3.2.1-20180825-bootsign.img
    gdrive: twrp-tb8703-3.2.1-20180825-bootsign.img

    Previous version

    This TWRP build has special function Sign boot whihc you have to click after install new version of ROM or mod like Magisk. It will append stock boot signature to your boot partition. This allows to boot with locked bootloader.
    TWRP with Boot Sign function screenshots:

    Fortunately you dont need to unlock bootloader, because not every Lenovo tab can be unlocked. Custom kernel and ROM can be runned by appending boot.sig signature extracted from stock rom to boot.img like
    Code:
    cat boot.img boot.sig > boot-signed.img
    It still cant be loaded by fastboot, but you always can flash it from TWRP. You can get boot.sig in my repo https://github.com/HighwayStar/android_device_lenovo_TB8703/blob/cm-14.1/twrp/recovery/root/boot.sig

    XDA:DevDB Information
    [ROM][UNOFFICIAL][7.1.2][tb8703f/x/r/n] LineageOS 14.1 for Lenovo TAB 3 8 plus P8, ROM for the Lenovo Thinkpad Tablet

    Contributors
    highwaystar_ru
    Source Code: https://github.com/HighwayStar/android_kernel_lenovo_msm8953/tree/cm-14.1-common

    ROM OS Version: 7.x Nougat
    ROM Kernel: Linux 3.10.x
    Based On: LineageOs

    Version Information
    Status: Testing

    Created 2018-05-27
    Last Updated 2018-08-25
    13
    2018-06-18
    • Fixed LED notification with apps with blue and green background, including battery cahrging indication > 90%
    • Updated Lineage code
    9
    2018-06-11
    • Fixed wifi and USB tethering (modem mode)
    • Fixed video playback, including camera video
    • Enabled wifi display (miracast).
    • Updated Lineage code
    9
    update
    2018-05-28
    Fixed notification LED
    Fixed backlight becomes darker on screen has dark content
    Show TB-8703F in About Phone for WiFi tablet version
    Complete disabled CapSensor, because it causing random touches, when you hold tablet
    7
    2018-08-04
    • Its probably final build for Lineage 14.1, next will be 15.1. Some final preparations done:
    • Removed some unused blobs
    • Fixed grayish colors in HAL3 camera app lik Google Camera mods.
    • LineageOS code updated
    • Device tree switched to subtreeway to include some needed caf modules like camera., gps, ipa. If you use sources please note cm-14.1 branch force pushed. Old branch saved to cm-14.1-backup
    • ROM installation process changed. Now works with encrypted /data partition. No need to format data when coming from stock ROM. Please use new TWRP build with Boot Sign function, please check first post for download link.