yashsingh1/xdaforums huggingface dataset:
[Nokia 7 Plus Guides, News, & Discussion] erprofe:
Funcionó!!!!

Después de volverme loco con el proceso he usado el archivo que enviaron al foro y pude instalarlo, ya tengo de vuelta el 8.1 con actualización a Agosto de 2018.

Después de probar el proceso muchas veces desde mi ordenador con windows 10 utilicé otro ordenador con windows 7 y sí funcionó a la primera. No sé si habrá algún problema con los drivers o habrá sido casualidad.

Lo que más me costó entender del proceso es que había que cambiar el slot al que no aparecía con el comando "fastboot getvar current-slot" y después volver al recovery mode manteniendo pulsadas las tecla volume-up y encendido, pero una vez hecho pude hacer el downgrade desde la tarjeta de memoria sin problemas.

Gracias y un saludo a los que aportáis soluciones.
[Nokia 7 Plus Guides, News, & Discussion] safron35:
Didn't work for me just gave timestamp errors on both a and b partitions?even tried August update
[Nokia 7 Plus Guides, News, & Discussion] safron35:
Managed to roll back now phone has updated to SEP security patch 8.1 Oreo,and system says it's up to date?no pie update lol for some reason there is no swipe up for home in gestures ,when there was previously?
[Nokia 7 Plus Guides, News, & Discussion] Mas mamat:
Cara rollback ke oreo nokia 6.1 plus gimana ya. Di nokia labs kok ga ada pilihannya
[Nokia 7 Plus Guides, News, & Discussion] pujolsk:
For the record, it is not possible anymore to be on Oreo if Pie is being seeded in your region.

I managed to downgrade using this method, but during initial activation process I was forced to download Pie update, and it was installed automatically....

So R.I.P. Oreo for me. I hope they will tune up this Pie soon, or I will be selling this phone...

Cheers
[Nokia 7 Plus Guides, News, & Discussion] erprofe:
Yo lo que hice fue quitar la sim y no configurar la wifi hasta que terminé de configurar al android 8.1

Al acabar entré en modo desarrollador y desactivé "actualizaciones automáticas del sistema" y ahora funciona perfectamente con android 8.1 aunque de vez en cuando me avisa que hay una actualización y no la instalo.

Un saludo
[Nokia 7 Plus Guides, News, & Discussion] pujolsk:
Not possible, in the second step during initial process it asks me to connect to network of any kind, and there is an update waiting as soon as you connect...
[Nokia 7 Plus Guides, News, & Discussion] erprofe:
Hola, pues a mi sí me lo ha permitido y de hecho he repetido el proceso de actualizar a Android 9 y volver a 8.1 otra vez para comprobar si era posible.

Yo tengo una versión TA-1046 vendida en España.

En mi móvil no me ha exigido ninguna conexión de datos, he quitado la SIM para no tener datos con el operador de telefonía y he podido omitir la configuración de una conexión Wifi, así he podido volver por segunda vez a la versión 8.1; es cierto que no he podido importar la configuración de la copia de seguridad almacenada en Google y he tenido que configurar el móvil de nuevo paso a paso, cuenta, aplicaciones, pantallas, tonos...

No sé en qué ha podido fallar el proceso en tu caso. Yo seguí los pasos del primer post uno a uno.

Un saludo.
[Nokia 7 Plus Guides, News, & Discussion] supera3:
Cant see wich partition is active , waiting for device all time...adb drivers installed a lot of times and nothing...any solution?
[Nokia 7 Plus Guides, News, & Discussion] sajnam:
thanks for sharing this method. its really works what you provided in instruction but you need a different rollback zip to downgrade that one here provided not working.
[Nokia 7 Plus Guides, News, & Discussion] pujolsk:
Which one did you use? Do you have stable Pie seeded in your country?
[Nokia 7 Plus Guides, News, & Discussion] safron35:
try putting .\ before fastboot ie, .\fastboot
[Nokia 7 Plus Guides, News, & Discussion] pujolsk:
Did you receive Pie update officialy, or you sideloaded?
[Nokia 7 Plus Guides, News, & Discussion] k3dar7:
"adb" drivers is for adb mode... you need also "fastboot" drivers for fastboot mode ;) not have Windows (in GNU/Linux is not need install any driver for adb or fastboot mode), but try install drivers from virtual CDROM while connect N7p to PC...
[Nokia 7 Plus Guides, News, & Discussion] supera3:
I istall these drivers a lot of times :(
[Nokia 7 Plus Guides, News, & Discussion] supera3:
3 diferent computer , waiting for device...
[Nokia 7 Plus Guides, News, & Discussion] erprofe:
Hola, a mi me dió ese mensaje muchas veces porque en vez de entrar con "bajar volumen+encendido" le daba a "subir volumen+encendido" por confusión... Además tuve que hacerlo desde windows 7 porque desde Windows 10 fallaba una y otra vez.
[Nokia 7 Plus Guides, News, & Discussion] supera3:
A ver, llevo años en android haciendo tutoriales incluso , no es mi caso , lo meto en fastboot desde adb asique no puede haber error, el problema es que estando ya en fastboot (Download ) simplemente se queda en waiting for device...probado en windows 10 y en Windows 7 desde maquina virtual
[Nokia 7 Plus Guides, News, & Discussion] erprofe:
Pues siento no poder ayudarte, a mi me costó entender los pasos del primer post y lo hice mal muchas veces hasta que se me iluminó la bombilla y me di cuenta de que lo había estado haciendo mal desde el principio y después he hecho el proceso de downgrade dos veces, la primera para recuperar en mi móvil la versión 8.1 y la segunda por pura curiosidad, a ver si era posible o no.

Sí que te puedo decir que chateé con el servicio técnico de Nokia que reconoció que había gente molesta por las características de la actualización y me aseguraron que estaban buscando soluciones a los problemas que le comenté.

Yo, personalmente, prefiero quedarme con android 8.1 y poder personalizar a mi antojo las pantallas que asumir la versión 9 y tragarme una pantalla con la barra de google y la fecha/hora/tiempo de la primera pantalla.

Yo no tengo tus conocimientos y espero que encuentres la solución y la postées para que todos puedan beneficiarse.

Un saludo.
[Nokia 7 Plus Guides, News, & Discussion] Qrzysio:
I've tried to downgrade from Android P to Oreo. Got the flash image from Nokia Developer site. Connected the phone via USB.

Then changed the slot from "a" to "b" and tried to flash, but I have got an error: "failed to mount /logfs: Invalid argument"

After reboot phone cannot start. It sticks on the "Nokia" logo screen. I've tried to set the slot back to "a", but it is "a" now. What to do? Please help.
[Nokia 7 Plus Guides, News, & Discussion] supera3:
El problema es que se queda buscando mi dispositivo yno lo encuentra
[Nokia 7 Plus Guides, News, & Discussion] pujolsk:
That error is normal, and happens every time at 94% of installing, but don't worry the firmware is already installed.

You just have to to wipe the device (factory reset) from recovery, and it should boot normaly.
[Nokia 7 Plus Guides, News, & Discussion] Qrzysio:
Wiping data/factory helped. Thanks!
[Nokia 7 Plus Guides, News, & Discussion] Qrzysio:
I have updated my phone to Android P, then downgraded to Oreo using the flash file from Nokia Developer website (B2N-213B-0-00WW-B05-update.zip). After wiping the data/factory partition phone starts normally and let me choose the language etc. The problem is system forces me to update the phone immediately, I cannot skip it in any way.

It just says: "Your phone needs to download an update and restart. size: 1471,3 MB. / This update may take several minutes to download and install. Afterwards, your device will automatically restart".

I'm afraid it's going to update to Android P again.

I have managed to downgrade to April package using the first file from xda developers site (https://xdaforums.com/nokia-7-plus/development/ota-nokia-7-plus-ota-links-t3818774). However, it is still the same. There is no way to skip the update.

What to do?
[Nokia 7 Plus Guides, News, & Discussion] pujolsk:
Yes, I was in the same shoes as you, and it took me a whole day and lots of flashing to figure out why I was forced to connect to network and download Pie again.

You have your google account, and most likely screen lock password, linked to your phone before you downgraded to Oreo.

Now go to Pie again, set up the phone and remove all accounts and security loks, sideload Oreo again, and you will be able to skip Pie during activation.

Viola :)
[Nokia 7 Plus Guides, News, & Discussion] Qrzysio:
That is quite tricky. I left the phone on for the whole night (on "welcome" screen). In the morning it turned out that the upgrade was already downloaded without my permission (!). So have I just installed it, didn't set up any accounts, did the factory reset and then flashed to Oreo again. It works. Thank you!
[Nokia 7 Plus Guides, News, & Discussion] pujolsk:
Yes, it took me at least 5 straight hours to figure that out, not to mention my nerves :)

You owe me a beer :)

Cheers
[Nokia 7 Plus Guides, News, & Discussion] Qrzysio:
I really do.
[Nokia 7 Plus Guides, News, & Discussion] sajnam:
yes, stable pie is available in this country where i m right now, but for downgrade firmware i got that firmware from narender singh in telegram nokia 7 plus group
[Nokia 7 Plus Guides, News, & Discussion] supera3:
Installed but Now my problem is need wifi or data for a update on configuration screen :(
[Nokia 7 Plus Guides, News, & Discussion] supera3:
i did all steps , but THIS ROM DOWNGRADE TO AUGUST PATCH :(
[Nokia 7 Plus Guides, News, & Discussion] pujolsk:
You can later install OTA updates without problems...
[Nokia 7 Plus Guides, News, & Discussion] jeerjay:
Hi all

In the first,thank you so much for your information.

Finally, I successful in rollback to oreo april 2018,

althought it tooks me several days to solve problems.

Now I am facing a problem is,

I would like to upgrade to the latest security patch(October) through OTA,

but it only shows 9.0 pie I can upgrade.

Do you also have the same problem? How to solve?
[Nokia 7 Plus Guides, News, & Discussion] Qrzysio:
You need to download each of update separately. Download links and the full instructions on how to do that are in the first two posts of this subject: https://xdaforums.com/nokia-7-plus/development/ota-nokia-7-plus-ota-links-t3818774
[Nokia 7 Plus Guides, News, & Discussion] supera3:
And how can i downgrade august to April?

I install but give me an error
[Nokia 7 Plus Guides, News, & Discussion] Qrzysio:
Boot into bootloader, set the active slot to "b" or "a" (different than active now), reboot into recovery and install a package via adb sideload.

More: https://xdaforums.com/nokia-7-plus/how-to/finally-downgrade-phone-official-t3849437

You may also need to wipe factory/data partition.
[Nokia 7 Plus Guides, News, & Discussion] pujolsk:
What was you previous build, Pie with September patch, or?

Thanks.

---------- Post added at 12:38 PM ---------- Previous post was at 12:28 PM ----------

Hello there, I have a question for you. I have spent the last hour trying to rollback to Oreo from Pie with the last October patch, and it throws time stamp error every time.

I know the procedure, I have changed the slot as it should be done, and I used the same method before, and it was working.

Did they changed something? Is downgrade still possible after October patch?

Thanks
[Nokia 7 Plus Guides, News, & Discussion] Qrzysio:
Did you install any patch for Pie already? If not, it should work. But the rule is that downgrade works only for those who didn't install any update for Pie. Anyway try to sideload different pack, as early as possible, the best to you the one from Nokia's website.
[Nokia 7 Plus Guides, News, & Discussion] pujolsk:
No luck. I have tried the one from the site, and all others...it must be because I have updated to October patch...

I am now stuck at this Pie...
[Nokia 7 Plus Guides, News, & Discussion] magiQx:
Hi, i tried to update to stable 9 Pie and went and updated each separately. Now im on android 8.1 October patch (went from august) and cant sideload to 9. every time i receive an update error and it deletes the file from root folder. Any idea on how to proceed?

Thanks!
[Nokia 7 Plus Guides, News, & Discussion] Qrzysio:
Update via OTA.
[Nokia 7 Plus Guides, News, & Discussion] Wagh liddi:
Can you downgrade without external sd card? Sim card stuck in there (without holder) :(

So is it still possible?
[Nokia 7 Plus Guides, News, & Discussion] Qrzysio:
Possible via adb. You dont need to upload to sdcard or internal storage. Just place the package in the same folder as you have ADB and FASTBOOT drives (.exe files). Then:

adb sideload filename.zip
[Nokia 7 Plus Guides, News, & Discussion] magiQx:
Hi.

from where did you get your hmd global fastboot device driver? Mine is google inc driver and im stuck at waiting for device. :(
[Nokia 7 Plus Guides, News, & Discussion] supera3:
try minimal adb and fasboot drivers https://androiddatahost.com/bnjkh
[Nokia 7 Plus Guides, News, & Discussion] supera3:
Cant downgrade from october pie patch , i try a lot of roms , nokia ****s us other time

Now cant install themes for substratum
[Nokia 7 Plus Guides, News, & Discussion] supera3:
dont works neither
[Nokia 7 Plus Guides, News, & Discussion] pujolsk:
Once on Pie and October patch it is not possible to downgrade...
[Nokia 7 Plus Guides, News, & Discussion] Qrzysio:
Will it remain like that, or it just takes time for experts to find the way how to downgrade?
[Nokia 7 Plus Guides, News, & Discussion] pujolsk:
There is a way but it requires official service tool and it is not free. I did it last Friday...

Btw when you ask me something you have to quote so I get the notification...
[Nokia 7 Plus Guides, News, & Discussion] mukulsharmaknh:
This works even if u are on october security update
[Nokia 7 Plus Guides, News, & Discussion] supera3:
Can you tell how did you do downgrade with october patch? Ntools imagine
[Nokia 7 Plus Guides, News, & Discussion] dexterboon:
the same goes here to . iam on pie oct patch , everytime when i try to downgrade to oreo , it shows me timestamp error. have you found any solution to this ? plzz reply ?
[Nokia 7 Plus Guides, News, & Discussion] supera3:
To me an verification error all time in recovery with oreo zips
[Nokia 7 Plus Guides, News, & Discussion] supera3:
which number and name of recovery do you have?¿

finish on 3_22D or 3_22C ?¿
[Nokia 7 Plus Guides, News, & Discussion] dexterboon:
3_22C recovery
[Nokia 7 Plus Guides, News, & Discussion] Purak6:
Have you tried it if you got successful downgrade please reply
[Nokia 7 Plus Guides, News, & Discussion] bigspoody:
I too am getting the same timestamp error message. Any thoughts on how to overcome this?

thanks
[Nokia 7 Plus Guides, News, & Discussion] Battle24:
What i did to downgrade is flashing system.img, vendor.img and boot.img from the B2N-132E-0-00WW oreo 8.0 build in fastboot.

Then boot up in recovery and apply update from ADB using B2N-213B-0-00WW-B05-update.zip.

Select wipe data/factory reset and reboot.

Booting up in Oreo 8.1 with april patch.
[Nokia 7 Plus Guides, News, & Discussion] Purak6:
You have unlocked bootloader or you did it on locked bootloader
[Nokia 7 Plus Guides, News, & Discussion] Battle24:
I have an unlocked bootloader.
[Nokia 7 Plus Guides, News, & Discussion] yameno:
hello, any solution to downgrade nokia 7 plus to orio from pie build number : 00ww_3_22c_sp01.

i tried all the methods here but no luck.

i hated my phone and the stock android because of this update.
[Nokia 7 Plus Guides, News, & Discussion] badboytien:
hey, i cant find out an official fastboot driver for my nokia 7 plus

plz help me

i have tried some google fastboot interface driver but didnt work
[Nokia 7 Plus Guides, News, & Discussion] saiz0313:
Can't rollback.

stamp error.

from android pie ,patch_2018/10/1(WW_3_22D)
[Nokia 7 Plus Guides, News, & Discussion] Toxina:
i cant rollback either - im on october 2018 android pie. :(
[Nokia 7 Plus Guides, News, & Discussion] k3dar7:
This is normal... in a/b slots you have always actual android version/update (in current slot) and previous android version/update (in other slot)...

Then if you now switch slot, then you have PieSeptember and Oreo have older timestamp and not posible sideload over Pie
[Nokia 7 Plus Guides, News, & Discussion] awesomeandroid:
Hi guys, I've sent my phone for repair at Nokia centre and now it was running offical Android Pie. Now I received it back and it's on Oreo.

I've tapped to check for update but it kept saying there's no update available. Any idea why?

Now I'm back on Android 8.1.0 (Security patch 1 April 2018).
[Nokia 7 Plus Guides, News, & Discussion] saiz0313:
Can I flash oreo stock-rom with OST ?

Can I flash TA-1046-B2N-132E-0-00WW-B07.nb0 into my TA-1062 ?

Do I need flash QFIL-file(TA-1062 or TA1046)?or just flash nb0-file?

ps.I buy TA-1062(6+64GB) in P.R.C ,and I use it in R.O.C. .
[Nokia 7 Plus Guides, News, & Discussion] Sparker0i:
This is no longer possible if you have installed the November update. :(
[Nokia 7 Plus Guides, News, & Discussion] xbatibotx:
this still works for me. but very tricky.
[Nokia 7 Plus Guides, News, & Discussion] Toxina:
i have the same issue, i guess i got the november update a bit early? it didnt work for me with the A/B-trick.

god.. what can i do now. i even bought an unlock key :(
[Nokia 7 Plus Guides, News, & Discussion] k3dar7:
change A/B is not trick, this simply switch to partitions with your PREVIOUS version ;)
[Nokia 7 Plus Guides, News, & Discussion] Toxina:
so there is literally no way i can unlock the bootloader, right? :(
[Nokia 7 Plus Guides, News, & Discussion] k3dar7:
1. You can try go into service center if flash Oreo before August update

2. Wait if MHD officialy support unlocking (currently only Nokia8)
[Nokia 7 Plus Guides, News, & Discussion] Wagh liddi:
Can you downgrade without an sd card?
[Nokia 7 Plus Guides, News, & Discussion] stevenjj27:
Not updating.

Do I need to set back the slot after downgrade?

Because I did it a few days ago and no update since, I am still on May 1st security patch.

---------- Post added at 03:59 AM ---------- Previous post was at 03:57 AM ----------

Same issue
[Nokia 7 Plus Guides, News, & Discussion] Toxina:
i bought the paid service of the chinese guy and he did it for me. it cost 7$, but i would say that it was very well spent =)
[Nokia 7 Plus Guides, News, & Discussion] awesomeandroid:
Checked for updates now I'm already on pie. Apparently they pulled out the update from the server. Now it's back.
[Nokia 7 Plus Guides, News, & Discussion] stevenjj28:
HELP!!

Just after I changed the slot I removed the cable and held the power button to turn off the phone, normal procedure right.

Now the phone is blank, doesnt show its charging and doesnt boot, adb doesnt recognize it either.

my pc shows it as the attached, qualcomm hs - usb qdloader 9008.

help please.
[Nokia 7 Plus Guides, News, & Discussion] Nandan95:
Bro I have tried but when click on ADB sideload option and put the file name in command prompt ,it doesn't work and after some minutes phone says timeout to receive the package

Why it appears ?

I am on December security patch
[Nokia 7 Plus Guides, News, & Discussion] packiyarajan:
Sadly this didnt worked out for me, even after changing the active slot, it gives me the timestamp error while sideload.

Info : I did more november and december updated after pie via OTA..

I want to revert back to oreo because of the WIFI issue raised after November update
[Nokia 7 Plus Guides, News, & Discussion] singhnsk:
The device has lost bootloader. You should use the QPST firmware and tool to flash the stock ROM on the device. It will be good afterward.

---------- Post added at 11:35 PM ---------- Previous post was at 11:31 PM ----------

It essentially only works if your secondary slot is still on Oreo release. For anything newer, the file will error out due to wrong timestamp. For a downgrade at this stage, you should either visit Nokia Care or buy a paid downgrade from online providers.
[Nokia 7 Plus Guides, News, & Discussion] slmxdaa:
I am getting waiting for device in the command window
[Nokia 7 Plus Guides, News, & Discussion] nexus723:
Awesome post :D Huge thanks! I do have one question for those downgrading. Why are you? I get 2 to 2,5 days with battery life so I dont see a reason to downgrade, if we talk about battery life

---------- Post added at 11:47 AM ---------- Previous post was at 11:46 AM ----------

Probably cause it either hasnt the drivers correctly installed, check this. If not you might not have developer settings turned on or done something else wrong
[Nokia 7 Plus Guides, News, & Discussion] slmxdaa:
Develpoer settimg is okay...

Adb is working fine..

And I can sideload the updates

But cant use fastboot
[Nokia 7 Plus Guides, News, & Discussion] k3dar7:
in fastboot mode is diferent usb id = need different driver, chech device manager and/or try install driver from virtual cdrom in n7p
[Nokia 7 Plus Guides, News, & Discussion] Rubens95:
I'm not sure, but you have to use old cmd, not windows powershell
[Nokia 7 Plus Guides, News, & Discussion] slmxdaa:
I can see my active slot.

But cant change it

Says fastboot.exe unknown comand
[Nokia 7 Plus Guides, News, & Discussion] singhnsk:
You should use a newer version of Fastboot.exe. You probably have an old one from the time when the dual slots didn't exist.
[Nokia 7 Plus Guides, News, & Discussion] slmxdaa:
Thanks I was able to change it
[Nokia 7 Plus Guides, News, & Discussion] slmxdaa:
shahriar mithun:

I sideloaded both the January patch

Then right now changed the active slot and back to January 1 patch

So if I again sideload jan2 patch..

A ND b both my slide will have the same patch

Can anyone answer
[Nokia 7 Plus Guides, News, & Discussion] singhnsk:
No. It will overwrite the earlier Jan2 patch. Updates go like A > B > A > B.

If your December was on Ab. Then Jan 1 = B, Jan 2 = A. Then you change from Jan 2 to Jan 1 = A to B. Then when you flash Jan 2 again, then it will go to B. That's my understanding of updates.
[Nokia 7 Plus Guides, News, & Discussion] slmxdaa:
I also got it. But jan1 is official but jan2 is not official

Now suppose, after jan1 HMD released Feb

Then I have to sideload February on jan1

Not on jan2.

I think u get my point
[Nokia 7 Plus Guides, News, & Discussion] singhnsk:
Yes, that's fair. And you can do that when it comes out :)
[Nokia 7 Plus Guides, News, & Discussion] M_w_B:
I am getting a timestamp error on both slots, is my only option to pay the 8 dollar for the personal bootloader unlock?

And what will they do what I can't seem to accomplish? Do they have a .zip with a custom timestamp or such? Can't we change the timestamp ourselves at any matter?
[Nokia 7 Plus Guides, News, & Discussion] k3dar7:
In second slot is your previous version, then if you have recent Pie then is newer that Oreo, then as i know only solution is as you type, or MAYBE you can try go to service center and ask for downgrade...
[Nokia 7 Plus Guides, News, & Discussion] M_w_B:
I paid for the unlocking, it was a very nice and quick procedure. Now the less nice procedure is to get my phone rooted as it won't boot with the TWRP versions I used so far...
[Nokia 7 Plus Guides, News, & Discussion] k3dar7:
https://xdaforums.com/nokia-7-plus/help/pie-october-update-failed-t3862758/post78285662
[Nokia 7 Plus Guides, News, & Discussion] M_w_B:
Yes it's that TWRP boot img suggested in that post. I also left what exactly goes wrong as a reply.

- EDIT - I solved the issue, I was not directed to the link to the TWRP so I took the one from the first page
[Nokia 7 Plus Guides, News, & Discussion] singhnsk:
Rooting can be done without TWRP too. Just boot a magisk patched image and install magisk. Done :)
[Nokia 7 Plus Guides, News, & Discussion] MadalinC:
On what patch were you before the unlock/downgrade?

I am on latest Pie (Jan 2019) and haven't figured out how to downgrade to April 2018. I've read everything I could find here on the forums and no luck.

Had a chat with Nokia support as well. Not very helpful and are refusing to offer any guidance or news about official bootloader unlock. :rolleyes:
[Nokia 7 Plus Guides, News, & Discussion] omkolte17:
Would it be possible for me to downgrade to Oreo from the latest Android Pie??

Android Pie with 1 Jan 2019 security patch level.

Model TA-1046