How to downgrade Samsung Galaxy S6 from Android 6 to 5.1.1? Odin fails.

[dudledok]

Everywhere I look the idea seems to be to use odin and get the appropriate firmware from SamMobile so I put in the details of the phone and downloaded this piece of firmware:
Download firmware: G920FXXU2BOG8_G920FBTU2BOG9_BTU - SamMobile

The phone is:
- model G920F
- a UK phone
- bought sim free unlocked

When attempting to flash the firmware onto the phone using odin it fails very early on. See the output in odin below:
<OSM> Enter CS for MD5..
<OSM> Binary Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/005> Added!!
<ID:0/005> Odin engine v(ID:3.1100)..
<ID:0/005> File analysis..
<ID:0/005> SetupConnection..
<ID:0/005> Initialzation..
<ID:0/005> Get PIT for mapping..
<ID:0/005> Firmware update start..
<ID:0/005> SingleDownload.
<ID:0/005> sboot.bin
<ID:0/005> NAND Write Start!!
<ID:0/005> FAIL!
<ID:0/005>
<ID:0/005> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)

And on the phone I get the following:
SW REV. CHECK FAIL. BINARY: 3, DEVICE: 2

The only suggestions I can find is that I am picking the wrong firmware, so I tried a couple others for the same model of phone but no luck.

What should I try next?

 

[waqqas31]

I'm also looking for the answer to the same question. Is it possible or not?

 

[wancohoff]

you must flash 4 files firmware and PIT files.. download there https://www.androidfilehost.com/?fid=24369303960688708 .

flash an working without problems. but wifi battery drain is still problem also on lolipop

 

[vider]

Agreed, samsung have made it a one way trip when upgrading your bootloader. Downgrading your bootloader will brick your phone. No need to downgrade from marshmallow. By battery life has never been so good.

Posted via the Android Central App

 

[Immanuel Kant]

I also get this error. I could't remove my own samsung account, so I deleted and recreated it, but now I cannot login and on the setput it asks me right after the wifi for the password, but when I type it in it says "processing failed" (((((((