Guide: downgrade from Oreo to Nougat (also bootloader) without unlocking

[Inerent]

Hello,
If you want to downgrade from Oreo to Nougat and also downgrade the Bootloader, just follow this simple tutorial:
1. Download your firmware (based to your carrier/region and firmware number that you wish) from here: https://www.xperiasite.pl/forum/395...rt_by=Z-A&sort_key=start_date&topicfilter=all
2. Unzip the firmware file, then go inside the folder and unzip the partition.zip file. Very important: The files that you unzipped from the partition.zip must be extracted in a folder named partition Try to avoid having firmware folder/partition/partition/files. You should have firmware folder/partition/files. Usually the unzip or unrar program creates this folder for you if you extract to folder, but some programs are creating folder/folder/files
3. Download Newflasher made by Munjeni: https://dl.xda-developers.com/4/4/7....rar?key=rdp_fMdVKfIo1hu_TSW6IA&ts=1523467912
4. Unzip the file, then copy newflasher.exe into the folder where is your unzipped firmware
5. Install Adb drivers, this can be done by installing Xperia Companion. You can download it here: http://www-support-downloads.sonymobile.com/Software Downloads/Xperia Companion/XperiaCompanion.exe
6. Power off your phone.
7. Connect the phone to the USB cable while holding volume down key for 3 seconds. Windows should pop up to install the adb driver. Wait until the install is finnished corectly.
8. Run newflasher.exe and follow on screen messages. If I remember first 2 you have to type N (no)
9. Wait until it says to disconnect (about 20 minutes on my pc)
10. Power on your phone. :good::fingers-crossed:
You will have your locked bootloader and warranty:cyclops:
Credits to Munjeni for his tool and Miustone for guiding:good:

 

[iArvee]

1. Download the Nougat FTF (using xperifirm, or the link above)
2. Flash using flashtool.

Simple as that, lol. There are a lot of guides on XDA on how to use Flashtool. A simple search would help.

 

[Inerent]

Is it safe to flash all sin files and also all ta files?
Is that hard to write a little guide for noobs? I am afraid to flash those ta files but also i don't want to end up with a nougat mixed with oreo files or bootloader

 

[Inerent]

I've managed to revert to nougat june security patch 45.0.A.5.1 and all my problems are resolved. 4k 60fps playback and scrolling are smooth again. Wi-Fi speed and stability is super. Facebook and Chrome scrolling is buttery smooth.
I have used latest newflasher and flashed every file included in firmware.
Bootloader is also the at the first version.

 

[madshark2009]

I've managed to revert to nougat june security patch 45.0.A.5.1 and all my problems are resolved. 4k 60fps playback and scrolling are smooth again. Wi-Fi speed and stability is super. Facebook and Chrome scrolling is buttery smooth.
I have used latest newflasher and flashed every file included in firmware.
Bootloader is also the at the first version.

When did we ever have [email protected] playback?
Plus wasnt it always butter smooth? Mine is super smooth on oreo i cant imagine anything smoother...

 

[amakuramio]

Every version android becomes heavier...
Im typing this from a z3 with 4.4 haha

---------- Post added at 07:04 AM ---------- Previous post was at 07:03 AM ----------

Every version android becomes heavier...
Im typing this from a z3 with 4.4 haha

 

[Inerent]

1. Try to play a 4k 60fps movies in YouTube and you will see that it does it in 30fps
2. Scrolling in facebook, chrome, play store, even in phone is lagging bad
3. Stuttering almost everywhere
Those are happening in the latest oreo... I factory repaired my phone 20 times, as soon as I opened it will silently update google play services and them lag.
This problem is not in nougat 45.0.A.5.1
See Sony's forum, it's full of people complaining about those lag and stuttering issues, also 4k and 2k 60fps is not in 60fps, in YouTube, is in 30, try it yourself.
The problem is google play services.
Maybe you are rooted and don't experiencing these issues...

 

[Inerent]

1. Try to play a 4k 60fps movies in YouTube and you will see that it does it in 30fps
2. Scrolling in facebook, chrome, play store, even in phone is lagging bad
3. Stuttering almost everywhere
Those are happening in the latest oreo... I factory repaired my phone 20 times, as soon as I opened it will silently update google play services and them lag.
This problem is not in nougat 45.0.A.5.1
See Sony's forum, it's full of people complaining about those lag and stuttering issues, also 4k and 2k 60fps is not in 60fps, in YouTube, is in 30, try it yourself.
The problem is google play services.
Maybe you are rooted and don't experiencing these issues...

 

[madshark2009]

1. Try to play a 4k 60fps movies in YouTube and you will see that it does it in 30fps
2. Scrolling in facebook, chrome, play store, even in phone is lagging bad
3. Stuttering almost everywhere
Those are happening in the latest oreo... I factory repaired my phone 20 times, as soon as I opened it will silently update google play services and them lag.
This problem is not in nougat 45.0.A.5.1
See Sony's forum, it's full of people complaining about those lag and stuttering issues, also 4k and 2k 60fps is not in 60fps, in YouTube, is in 30, try it yourself.
The problem is google play services.
Maybe you are rooted and don't experiencing these issues...

No dude im not rooted, this video on [email protected]
https://youtu.be/VAF4rfu-ETA
My phone plays it real good smooth as 60fps should be maybe the video you tried was rendered as 60 but was actually 30?
And in terms of stuttering speed my phone is actually faster than ever...
I can show you a video if you think im wrong which i highly doubt that, I work with music and videos and i really can tell if its lagging or not 60fps, i can also tell by every update some updates made my phone alower maybe yah but this one im on is pretty smooth
And im on 47.1.A.12.119

 

[08187820]

1. Download the Nougat FTF (using xperifirm, or the link above)
2. Flash using flashtool.

Simple as that, lol. There are a lot of guides on XDA on how to use Flashtool. A simple search would help.

Good evening I have a g8141 with unlocked bootloader. If I downgrade from oreo to 45.0.A.5.1 does the bootloader remain unlocked or re-lock?

 

[Inerent]

Good evening I have a g8141 with unlocked bootloader. If I downgrade from oreo to 45.0.A.5.1 does the bootloader remain unlocked or re-lock?

Hello,
The bootloader re-locks I guess. But you should try. I'm assuming that this will not bring you back missing TA partition DRM keys. Check my tutorial on the first post how to downgrade to Nougat.

 

[iArvee]

Good evening I have a g8141 with unlocked bootloader. If I downgrade from oreo to 45.0.A.5.1 does the bootloader remain unlocked or re-lock?

Your bootloader will remain unlocked.

 

[Inerent]

Strange thing, I have updated to the latest Oreo (7 updates) and the phone is again blazing fast. Never did XC repair.
Maybe it was an issue with fragmented partitions?!?! ?
Now is as fast as possible with literally 0 lag, even in facebook or play store. I also did signed for google play services BETA program!

 

[teatea]

Somehow, I had lost my imei during trying to downgrade to Nougat.

Can anyone help?

Everytime i dial *#06# it just show blank now.....

 

[LukeyWolf]

1. Download the Nougat FTF (using xperifirm, or the link above)
2. Flash using flashtool.

Simple as that, lol. There are a lot of guides on XDA on how to use Flashtool. A simple search would help.

How do you get the older ftf files when all it shows is the latest version?
Also my phone has a locked bootloader, will flashtool brick it?

 

[iArvee]

How do you get the older ftf files when all it shows is the latest version?
Also my phone has a locked bootloader, will flashtool brick it?

Try finding old firmware here: http://www.xperiablog.net/forum/resources/

No, flashtool will not brick it.

 

[jax79sg]

Hi, will this work with Xperia XZ2 model H8266 ?

 

[4rz0]

Hi, will this work with Xperia XZ2 model H8266 ?

No, there's no Nougat ROMs available for that phone.

 

[madshark2009]

Hello,
If you want to downgrade from Oreo to Nougat and also downgrade the Bootloader, just follow this simple tutorial:
1. Download your firmware (based to your carrier/region and firmware number that you wish) from here: https://www.xperiasite.pl/forum/395...rt_by=Z-A&sort_key=start_date&topicfilter=all
2. Unzip the firmware file, then go inside the folder and unzip the partition.zip file. Very important: The files that you unzipped from the partition.zip must be extracted in a folder named partition Try to avoid having firmware folder/partition/partition/files. You should have firmware folder/partition/files. Usually the unzip or unrar program creates this folder for you if you extract to folder, but some programs are creating folder/folder/files
3. Download Newflasher made by Munjeni: https://dl.xda-developers.com/4/4/7....rar?key=rdp_fMdVKfIo1hu_TSW6IA&ts=1523467912
4. Unzip the file, then copy newflasher.exe into the folder where is your unzipped firmware
5. Install Adb drivers, this can be done by installing Xperia Companion. You can download it here: http://www-support-downloads.sonymobile.com/Software Downloads/Xperia Companion/XperiaCompanion.exe
6. Power off your phone.
7. Connect the phone to the USB cable while holding volume down key for 3 seconds. Windows should pop up to install the adb driver. Wait until the install is finnished corectly.
8. Run newflasher.exe and follow on screen messages. If I remember first 2 you have to type N (no)
9. Wait until it says to disconnect (about 20 minutes on my pc)
10. Power on your phone. :good::fingers-crossed:
You will have your locked bootloader and warranty:cyclops:
Credits to Munjeni for his tool and Miustone for guiding:good:

downgrading bootloader? is that ok? like can I flash the newest .179 afterwards if any thing goes wrong?

 

[SilverGamer_YT]

downgrading bootloader? is that ok? like can I flash the newest .179 afterwards if any thing goes wrong?

Hey , are you sure if I have unlocked bootloader and I went to nougat from Oreo I will lock my bootloader