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 -
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-
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 :
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.
And change the length from the address you found under "userdata" in scatter file like this and tap ok.
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).
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.
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).
After its finished, it will show "Download OK" popup.
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.
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-
TROUBLESHOOTING.
If you get this error
Then go to options and disable "Check LIB DA Match".
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 :
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.
And change the length from the address you found under "userdata" in scatter file like this and tap ok.
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).
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=aAfter 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).
After its finished, it will show "Download OK" popup.
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.
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