[Galaxy S6 Edge+ General] Peter Griffin:
- WARNING -

This Guide is not failproof, if you do anything wrong with your device while following this guide, i won't be held responsible if you brick or hard damage your device. I insist about that but you must extract all of your data (Photos, Videos, Music, Apps, Accounts, Messages, ETC) Before proceeding or else you will end up with a loss of data, again i'm still not responsible if you lose all of your data without backing up. I WARNED YOU.

Well, you have a Galaxy S6 edge+/S6/S6 edge lying around and you want to get back to Lollipop? You want to downgrade? Well then you're in the right place!

So......downgrading to lollipop...... some people claimed it can be done by deleting some file in the odin .tar but that never worked for me.

If you have the sw rev check fail error upon downgrading....this is the guide for you!

This will wipe all your data including internal storage (depending on how you do it)

Confirmed working on my Galaxy S6 edge+ SM-G928F [It should work on Note5 but no promises from now on]

Note: 5.1.1 Lollipop does not work on S6/S6 edge devices, you can only downgrade them to 5.0.2, if you want to downgrade to 5.1.1 Lollipop, it will only work on Galaxy S6 edge+

Advantages :

Downgrade procedure is safe, simple.

Your phone should boot faster

battery life should last longer [i said it should]

You can get the animated lock screen animations back.

Get old touchwiz back. [i like the 5.1.1 version]

disadvantages:

1. You cannot boot TWRP while on the downgraded bootloader

2. You will only have system-wide root. DO NOT flash systemless or it will not boot (but nobody cares)

3. Fingerprint is not working (still working on that)

4. You can only flash stock nougat from odin. You cannot flash lolipop, marshmallow tar,twrp tar,cf auto root tar or anything else [except if you have a combination firmware]

Ok, let's get started.

Requirements :

A laptop or home PC : At least running Windows 8/8.1 or Windows 10

Your device

Genuine Samsung charging cable [NOT SPONSERED]

Stable internet connection.

Files :

The lastest SAMSUNG Drivers which can be found here : https://developer.samsung.com/android-usb-driver

Odin3 : https://www.samsungodindownload.com/fr/download-for-windows

The firmware you want to downgrade to : I will link my ROM so u can install it.

TWRP [Newest version] : https://twrp.me/samsung/samsunggalaxys6edgeplus.html

Classy Kitchen [for bulding your rom] : https://xdaforums.com/t/tool-windows-gui-classykitchen-for-android-roms-development.3862584/

Now let's get started!

Let's start first by cooking the ROM! Open Classy Kitchen, and then open the ROM you want to use :

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Normally the first time you open the program, there shouldn't be any project [except if you used this app before]

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Next click "Create new project", "From PC (Browse for one)"

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And then chose the path where you saved your firmware. After chosing your firmware, Classy Kitchen will open the firmware automaticly.

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After the ROM is now open, click on "ROM utils" and then click on "Deodex ROM" After you Deodex the ROM, we will have to de-bloat it.

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On Classy Kitchen, click on "Debloat / Re-Bloat ROM" to Debloat your ROM.

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Last step [optional] We will have to De-Knox our ROM. (again optional) But De-Knoxing our ROM can save a lot of space in our phone storage. So i recommend you do.

After De-Knoxing our ROM, we will have to disable DM-Verity Force Encryption in order to Boot into the ROM [Otherwise if you don't your phone will never boot]

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Click on "Remove DM-Verity / Force Encryption"

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Next that we disabled DM-Verity, We will have to remove the "meta-inf installer"

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Click on "Re-Build META-INF installer" and click on remove.

Finally once we have done the modifications on our ROM, we just have to save. View attachment 5913515

Click on "Build (system.new.dat) ROM (for recovery)"

and then we are done cooking our ROM!

But the guide is not done yet. We will have to install TWRP in the phone.

HOW-TO-PROCEED?

Step-1 Press and hold the power button on your device

Step-2 Chose "Power Off"

Wait for your device to completly Shut-Off.

Step-3 Re-Boot in download mode "odin mode"

Step-4 connect the phone to your computer

Step-5 open Odin3

In Odin, we will have to install TWRP, click on the AP box and chose your TWRP file [the one that you downloaded]

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Don't forget to disable "Auto-Reboot" after installation, otherwise your phone will re-boot normal into Android.

At this point, Knox is tripped in your device meaning that your warranty is now expired. Also the Knox features are no longer usable.

On TWRP, click on wipe, "Format Data". A keyboard will pop-up, type "yes"

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Type "yes"

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Once Data Format is completed, hit home, reboot, recovery.

your phone will reboot into recovery again, hit wipe again, this time we won't format data. Instead we're going to wipe the phone's partitions

Chose in TWRP,

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Then swipe to wipe. Then hit home again. Next hit "Install"

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Install the ROM you just made with Classy Kitchen. It can be found in "Documents" - "Output" - "Your-ROM"

Transfert it to your phone

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Click on the ROM / ZIP file and "swipe to confirm flash"

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After the flashing procedure is complete, you will have to wipe the "cache" / Dalvik.

Hit "wipe dalvik/cache"

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Then "swipe to wipe"

After you wiped the cache, hit "Reboot System" and hit "Do Not Install"

One last step before you get back to Lolipop. You will need a custom Bootloader in order to boot.

Just download my "custom Bootloader" which is down the thread.

After you downloaded my "custom bootloader" you will have to install it.

so get Odin3 and install my bootloader!

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After the Bootloader installation is complete, you just have to reboot your device, cross your fingers and hope it boots!

Congratuations! You are back on Lolipop! Enjoy!

1 : If you want to flash a mod in TWRP, you will have to put your phone in download mode, install the stock bootloader in BL tab, install TWRP in AP tab and then click on "start"

2 : If you want to get back into marshmallow / Nougat, you just have to flash stock firmware in Odin3

If you have any issues or any questions, you can DM me but it isn't guaranteed that i will reply.