[Samsung Galaxy S8 Guides, News, & Discussion] DooNuts:
Iam happy to get a second SM-G950F so i could try out some testst.

With the second one I try the Update to Android Pie 9.0 U5, yes i know now that i better go only to U4 but **** happens.

I could not Downgrade the Pie 9.0 U5 to any Oreo 8.0 U4 so i try to test with my first G950F what still have the Oreo 8.0 U4.

I make backups from the Partitions with TWRP, copy the Partitions to my SD-Card put the Card in the second G950F and recover only 4 Partitions, and it works. I getr an SM-G950F Oreo 8.0 U5 (On the EFS and Baseband from the Pie 9.0 U5)

[IMG="Pic001"]https://ibb.co/dPrtB2F[/IMG]

[IMG="Pic002"]https://ibb.co/s6XDyxx[/IMG]

[IMG="Pic003"]https://ibb.co/WK16FgZ[/IMG]

If anyone like to test it, only on your Own risk!! Here is all you Need!!

In order iam new here i could not post any link but if you need the files send me an pm and i send you the links.

SM-G950F Downgrade Android Pie 9.0 U5 XEU to Android Oreo 8.0 U5 XEU with TWRP Partition Backup (Untouched EFS & Baseband)

## Based on an TWRP-G950F-PHN-Oreo-U4 Partition Backup

## and TWRP-G950F-DBT-Oreo-U5_&_Pie-U5 Partition Backup

## FW G950FXXU4CRI5-v8_U4_PHN and G950FXXS5DSJ1-v9_U5_DBT

-* All what you do now is on your OWN RISK *-

-* Know that you can Crash/Brick your Mobile *-

## Included Partitions ##

# Boot

# Recovery

# System

# Data

## What we need?

+32GB SDHC Card

# Windows Software (Latest Versions)

# Samsung Smart Switch

# Samsung Odin3

# Android Software (Latest Versions)

# TWRP as flashable dreamlte.img.tar

# TWRP as APK

# SuperSU as flashable zip

# SuperSU as APK

# SM-G950F-XEU-v8.0_TWRP_Stok_Factory_Reset_Partition_Backup

1. Make a Full-Backup from your Data via SmartSwitch on your PC.

2. Is the latest TWRP Version installed?

Than go to the TWRP Recovery Mode (Bixbi+VolUp+PWR), go to

"Save" mark all Partitions and swipe to save a compleate Partition Backup from your running Android Version to could Backup if its Crashed.

Wait til the Backup is finished and go Back to the MainMenu in TWRP.

3. Connect your Mobile to your PC and go to the following Folder

"\YourPC\Galaxy S8\Micro SD-Card\TWRP\Backups".

Inside here is the Folder with your Original Backup.

Move the Folder "2019-00-00--R16NWG950F....." to your PC.

4. Download your favorite "XEU-v8.0_TWRP_Stok_Factory_Reset_Partition_Backup"

extract the file on your PC, copy the Folder to your SD-Card

"\YourPC\Galaxy S8\Micro SD-Card\TWRP\Backups".

[IMG="SD-TWRP-Path"]https://ibb.co/rms784d[/IMG]

5. Copy the latest Version of SuperSu to your SD-Card

"\YourPC\Galaxy S8\Micro SD-Card".

6. Go in TWRP on "Recover", in normal case the backup would found automaticly.

Chose/Mark all of the 4 Partitions and swipe to Recover them.

7. If the installation is finished, swipe to restart the System.

### First Boot Take some Time !!!

### Hang on Logo with Blue LED !! WAIT !!

### Could take more than 5 minutes !!

8. If the first Boot is Finished you get an fresh Factory-Resetted S8 with Android 8.0 Oreo and TWRP-Boot but non Root. So you have to make all the steps... Developer Mode, SuperSU install via TWRP and APK and TWRP APK instal to Root it again!

9. Now you could also play your Backup back to your Phone with SmartSwitch ;) and go back on work with your Data!

Finished, enjoy your Downgraded S8 Oreo with the Pie Baseband

In order iam new here i could not post any link but if you need the files send me an pm and i send you the links.