[GUIDE] How to Downgrade / Unbrick /Flash Stock Firmware Nokia 5.1 Plus.

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bx2nero

Senior Member
Apr 22, 2015
292
85
This guide is for downgrading /Unbrick /Flash Stock Firmware Nokia 5.1 plus to Android Pie or Oreo.

This is STRICTLY for Global Nokia 5.1 plus variant NOT for Chinese variant Nokia X5. If you want to downgrade Chinese variant then follow this guide by hikari_calyx
Guide For Chinese Variant (X5).

What you need ::


1.MTK- Smart Phone Flashing tool which can be downloaded here. (v5.1804) Download

2.Android platform tools and ADB and fastboot drivers . Download

3. MTK Port drivers , For windows only. Download

4.FIRMWARE -
  • Oreo - PDA-1100-0-00WW-B01_unpacked.7z from . Download
  • Pie - PDA-214A-0-00WW-B01.full.zip from here . Download

STEP 1 : Backup your important files from internal storage and remove all google accounts from your phone to prevent FRP lock.

STEP 2 : Install all drivers and files mentioned above and extract your desired Firmware .

STEP 3 : Create a full backup using SP Flash tool (must do).

Open Smart Phone Flash Tool, choose the Download Agent file and Scatter File from the unpacked firmware.
DO NOT USE DOWNLOAD AGENT FROM THE FLASH TOOL ITSELF, USE ONLY THE ONE PROVIDED IN THE FIRMWARE.

Should look like this-
Screenshot from 2021-01-31 12-59-17.png



TROUBLESHOOTING.

If you get this error

LIB-DA-not-match-error-min.png


Then go to options and disable "Check LIB DA Match".

1611928718706.png

Then move to "Readback" and tap on add and choose you location where you want save you backup after that you double click on the created readback section and you will see this :

Screenshot from 2021-01-31 13-03-28.png


Use any text editor to open the scatter file from extracted firmware , and find "userdata". You'll need the start address of userdata as the length of the full backup.
Screenshot from 2021-01-31 13-04-07.png




And change the length from the address you found under "userdata" in scatter file like this and tap ok.

Screenshot from 2021-01-31 13-04-36.png


Click on "Readback" and the connect you phone in flashing mode with both volume button pressed and release upon the readback process starts ( you can see it in the lower progress bar).

Screenshot from 2021-01-31 13-06-54.png


STEP 4 : Upon completion of the readback process , close SP Flash tool and unplug you phone and trigger it to fastboot mode and change your Active partition to "a" by this command.
Open cmd to use this command.

Code:
fastboot --set-active=a

Screenshot from 2021-01-31 13-15-48.png


After this process completes , power off you phone .

STEP 5 : Flashing your firmware.
Open SP Flash Tool and check that DA and Scatter is loaded from your extracted Firmware.
Choose "DOWNLOAD ONLY" mode , not any other or you will loose important partitions.
Then click on download and connect your phone in flashing mode by both volume button pressed and release upon the download process starts ( you can see it in the lower progress bar).

Screenshot from 2021-01-31 13-43-01.png


After its finished, it will show "Download OK" popup.

1f97e3897519622afb94d.png


Now just close SP Flash tool , unplug you phone and reboot.


Enjoy your downgraded/ Unbricked Nokia 5.1+.

Special thanks to :
hikari_calyx for Firmware and solving all the errors.
Someone , Someone and Someone for testing this guide.

Hit Thanks if it worked for you. :D
 
Last edited:

Ibbi786

Senior Member
Nov 13, 2015
263
70
New Delhi
Tested, guide works perfectly. Also, the given Android version in this guide is 9 (February SP) for those who want to know.
 

Pelmewek

New member
Apr 24, 2020
1
0
For some reason, the wifi doesn’t work for me, it just falls off and connects again (how to fix it?
 

xdriv3r

Member
Jun 24, 2014
41
8
Moto G5 Plus
Meizu M2 Note
Did you follow step 1 - remove Google account to prevent FRP Lock.
Try hard resetting, reset from recovery.
It's just one compulsary update. Around September 2019 sp. I'm good now. I thought I had hardbricked the device when I changed primary partition to b and got stuck in bootloop unable to go into recovery. Then I used volume down + power and usb to directly get into fastboot.
 

bx2nero

Senior Member
Apr 22, 2015
292
85
It's just one compulsary update. Around September 2019 sp. I'm good now. I thought I had hardbricked the device when I changed primary partition to b and got stuck in bootloop unable to go into recovery. Then I used volume down + power and usb to directly get into fastboot.
Why did you changed your primary partition to B.
 
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  • 6
    This guide is for downgrading /Unbrick /Flash Stock Firmware Nokia 5.1 plus to Android Pie or Oreo.

    This is STRICTLY for Global Nokia 5.1 plus variant NOT for Chinese variant Nokia X5. If you want to downgrade Chinese variant then follow this guide by hikari_calyx
    Guide For Chinese Variant (X5).

    What you need ::


    1.MTK- Smart Phone Flashing tool which can be downloaded here. (v5.1804) Download

    2.Android platform tools and ADB and fastboot drivers . Download

    3. MTK Port drivers , For windows only. Download

    4.FIRMWARE -
    • Oreo - PDA-1100-0-00WW-B01_unpacked.7z from . Download
    • Pie - PDA-214A-0-00WW-B01.full.zip from here . Download

    STEP 1 : Backup your important files from internal storage and remove all google accounts from your phone to prevent FRP lock.

    STEP 2 : Install all drivers and files mentioned above and extract your desired Firmware .

    STEP 3 : Create a full backup using SP Flash tool (must do).

    Open Smart Phone Flash Tool, choose the Download Agent file and Scatter File from the unpacked firmware.
    DO NOT USE DOWNLOAD AGENT FROM THE FLASH TOOL ITSELF, USE ONLY THE ONE PROVIDED IN THE FIRMWARE.

    Should look like this-
    Screenshot from 2021-01-31 12-59-17.png



    TROUBLESHOOTING.

    If you get this error

    LIB-DA-not-match-error-min.png


    Then go to options and disable "Check LIB DA Match".

    1611928718706.png

    Then move to "Readback" and tap on add and choose you location where you want save you backup after that you double click on the created readback section and you will see this :

    Screenshot from 2021-01-31 13-03-28.png


    Use any text editor to open the scatter file from extracted firmware , and find "userdata". You'll need the start address of userdata as the length of the full backup.
    Screenshot from 2021-01-31 13-04-07.png




    And change the length from the address you found under "userdata" in scatter file like this and tap ok.

    Screenshot from 2021-01-31 13-04-36.png


    Click on "Readback" and the connect you phone in flashing mode with both volume button pressed and release upon the readback process starts ( you can see it in the lower progress bar).

    Screenshot from 2021-01-31 13-06-54.png


    STEP 4 : Upon completion of the readback process , close SP Flash tool and unplug you phone and trigger it to fastboot mode and change your Active partition to "a" by this command.
    Open cmd to use this command.

    Code:
    fastboot --set-active=a

    Screenshot from 2021-01-31 13-15-48.png


    After this process completes , power off you phone .

    STEP 5 : Flashing your firmware.
    Open SP Flash Tool and check that DA and Scatter is loaded from your extracted Firmware.
    Choose "DOWNLOAD ONLY" mode , not any other or you will loose important partitions.
    Then click on download and connect your phone in flashing mode by both volume button pressed and release upon the download process starts ( you can see it in the lower progress bar).

    Screenshot from 2021-01-31 13-43-01.png


    After its finished, it will show "Download OK" popup.

    1f97e3897519622afb94d.png


    Now just close SP Flash tool , unplug you phone and reboot.


    Enjoy your downgraded/ Unbricked Nokia 5.1+.

    Special thanks to :
    hikari_calyx for Firmware and solving all the errors.
    Someone , Someone and Someone for testing this guide.

    Hit Thanks if it worked for you. :D
    1
    Cant compltete the readback prccess what should i do?
    Which version of SP flash tool are you using ??
    1
    I used the latest version. I'm going to try again with the recommended version. Thank you .
    Use Sp flash tool version 5.1804 or 5.1824.
    Read the instructions carefully ..
    1
    How to backup using sp flashtool?
    You must backup your personal data and remove Google account before starting.
    The readback process is the backup process in SP flash tool.
    1
    Alas, no mirror found:

    https://tpedutw-my.sharepoint.com/:...dFks--5G6V4vYBGTwLw1BsthbtIuJqMUN3tQ?e=wOfytH


    Try from here
    Make sure you download the file mentioned.
    PDA_214A_0_00WW_B01_full