10-31-2018 02:31 PM
27 12
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  1. CraftyMe2323's Avatar
    I posted this in another thread but I figured it might be best to start a new thread for those who may not know the process of downgrading using Odin, for others like me who absolutely despised Oreo...

    Very easy!

    First off... Pro tip: DO NOT RESTORE FROM YOUR GOOGLE BACKUP OR ANY BACKUPS WHATSOEVER! START COMPLETELY FRESH!

    Go to Sammobile, go to the firmware section, type in and search for your model number, and download the latest nougat file for your phone and carrier. It takes a while to download if you register a free account (a few hours for me) ... make sure you have the latest Odin installed, which you'll find a link to from that same page in the instructions section if you scroll a little ways down. Sign out of ALL Samsung and Google accounts on the phone before starting the process. Follow the instructions carefully and you'll be all set. There's also a video you can and should watch. If any of you end up doing it, I highly recommend skipping the initial setup process, powering down, and booting into stock recovery (volume up, Bixby button and power button held at the same time) and factory reset again (my ritual is 3 times in a row for good measure, then reboot system)

    It's that simple!

    Good luck!
    03-24-2018 07:48 PM
  2. hallux's Avatar
    Nice write-up, also covered in an ambassador's guide - https://forums.androidcentral.com/am...interface.html

    It should be pointed out that you would want to be sure you have a backup of any data on the device before starting the process as it WILL get wiped. Also of note is that this does not prevent you from getting nagged to update again.
    03-24-2018 09:19 PM
  3. CraftyMe2323's Avatar
    Nice write-up, also covered in an ambassador's guide - https://forums.androidcentral.com/am...interface.html

    It should be pointed out that you would want to be sure you have a backup of any data on the device before starting the process as it WILL get wiped. Also of note is that this does not prevent you from getting nagged to update again.
    Yes, thank you... I forgot to include this very important bit of information about backing up your data. In my mind that's obvious, but it's not for everyone so I should have included that.

    Also, there's a toggle in developer options called "Auto update system" that can be turned off to prevent being nagged to update. Working well for me so far. Or, one can always invest in Package disabler pro to disable system updates.
    Attached Thumbnails How To Downgrade From OREO To Nougat-7878.jpg  
    03-24-2018 09:57 PM
  4. DerHof's Avatar
    I'm on sammobile but unsure what file to download.
    There are 4 files from March 15... under country/carrier two are unknown, one is Sprint, and the other is Virgin Mobile. I have ATT... which is not listed on any of the downloads.
    Any idea which file it is?
    03-27-2018 09:12 AM
  5. CraftyMe2323's Avatar
    I'm on sammobile but unsure what file to download.
    There are 4 files from March 15... under country/carrier two are unknown, one is Sprint, and the other is Virgin Mobile. I have ATT... which is not listed on any of the downloads.
    Any idea which file it is?
    Not sure if this is allowed, but I'm doing it anyway. Here's what you're looking for - assuming you have the S8 and not the plus model...
    https://forum.xda-developers.com/att...mware-t3730893
    03-27-2018 11:58 AM
  6. DerHof's Avatar
    Not sure if this is allowed, but I'm doing it anyway. Here's what you're looking for - assuming you have the S8 and not the plus model...
    https://forum.xda-developers.com/att...mware-t3730893
    Actually I have both but the regular S8 would be the one I would try first since I'd have minimal stuff to back up compared to my +.
    I did a search on that site and found 4 similar downloads for the + but not the right ones.

    Thank you much!

    EDIT>>> I thought these 2 phones were identical except for size? Still needs a different file?

    ... unless this is it
    https://forum.xda-developers.com/att...mware-t3715745
    03-27-2018 12:19 PM
  7. CraftyMe2323's Avatar
    Actually I have both but the regular S8 would be the one I would try first since I'd have minimal stuff to back up compared to my +.
    I did a search on that site and found 4 similar downloads for the + but not the right ones.

    Thank you much!

    EDIT>>> I thought these 2 phones were identical except for size? Still needs a different file?
    You're welcome!

    Yes, still a different model number. SM-G950U VS SM-G955U for the plus model. The firmware files would be slightly different, and as far as I know not interchangeable.

    Good luck with the downgrade! And don't worry about any errors you might get on the phone. If Odin says it was successful, you're good. Just wait for it to reboot (which might take a while the first time) and skip through the initial setup process, reboot into recovery, factory reset again, reboot system and you'll be good to go.
    DerHof likes this.
    03-27-2018 12:28 PM
  8. DerHof's Avatar
    Yes, still a different model number. SM-G950U VS SM-G955U for the plus model. The firmware files would be slightly different, and as far as I know not interchangeable.
    I edited my post a couple times and your quote doesn't have the link in my second edit so I'm assuming you didn't see it.
    If you have a second since you obviously know way more about this than me... could you take a look at it and confirm it would be good for the S8+
    03-27-2018 12:38 PM
  9. CraftyMe2323's Avatar
    I edited my post a couple times and your quote doesn't have the link in my second edit so I'm assuming you didn't see it.
    If you have a second since you obviously know way more about this than me... could you take a look at it and confirm it would be good for the S8+
    Yeah I saw it, my fault I meant to comment on that. The link I posted is good for your S8 on ATT. The link you posted is good for your S8+ on ATT. They aren't interchangeable, so be sure you're using the right files for the right phone.
    03-27-2018 12:54 PM
  10. CraftyMe2323's Avatar
    I edited my post a couple times and your quote doesn't have the link in my second edit so I'm assuming you didn't see it.
    If you have a second since you obviously know way more about this than me... could you take a look at it and confirm it would be good for the S8+
    How did the downgrade go?
    04-05-2018 09:11 AM
  11. DerHof's Avatar
    How did the downgrade go?
    Hey, thanks for asking... and for the help.

    The short answer is I didn't try it yet.
    I wanted to wait until the weekend in case I ran into any problems.
    Since then I've become obsessed with finishing my arcade cabinet... Changing over from Hyperspin to Launchbox (if you're familiar with the hobby)... and adding quite a few emulators I never intended to.
    Hoping to have it done in the next few days then back to the phone.

    I'll definitely post my results though.
    04-05-2018 09:06 PM
  12. CraftyMe2323's Avatar
    Hey, thanks for asking... and for the help.

    The short answer is I didn't try it yet.
    I wanted to wait until the weekend in case I ran into any problems.
    Since then I've become obsessed with finishing my arcade cabinet... Changing over from Hyperspin to Launchbox (if you're familiar with the hobby)... and adding quite a few emulators I never intended to.
    Hoping to have it done in the next few days then back to the phone.

    I'll definitely post my results though.
    Vaguely familiar with Launchbox. Sounds awesome! I have my original Xbox modded with a bunch of emulators and a seemingly endless list of classic games, so I definitely understand the obsession lol
    04-05-2018 11:02 PM
  13. nomorevideos's Avatar
    I have a few small questions about this, sorry for being dumb.

    First off, I went to sammobile and and searched for firmware for my Galaxy A5 2017 (SM-A520F) and my first question is, does it matter which carrier I choose? I am from Austria and my phone is from TMobile, but it was fully unlocked for all carriers. I currently have Telering as my pre-paid carrier, so do I choose its firmware?
    Furthermore, this method of flashing the OS via Odin does work for all Samsung phones, not just the S8 and S8+? Or will it not work with my A5 2017? Also, how do I get the developer options, to turn off auto updates? I don't want to go through this just so the phone redownloads the newest version after only a few days.
    Sorry for asking so many questions, but I just really wanna have the older version of Samsung Experience back, so I can use my custom AOD background again.
    05-17-2018 03:22 AM
  14. Norg's Avatar
    I've been attempting to downgrade from an early 8.0 back to stock 7.0 for my S8+ for more than a week, at least 25 attempts using ODIN3 latest and ALWAYS ENDS WITH FAIL?? I have was I think are the correct codes for my AT&T s8+ "G955USQU1AQC9_G955UOYN1AQC9_ATT" downloaded from Sammobile. And Yes, I have latest Samsung drivrs, good cable, that sort of thing...

    DOES ANYONE HAVE ANY IDEA WHAT I CAN DO NEXT, I'M REALLY OUT OF CREATIVE OPTIONS!!! HELP PLEASE!!!
    06-09-2018 08:58 AM
  15. Rere1980's Avatar
    I'm having the exact same issue with my s8+ sprint. I can not get it downgraded..... please help.
    Imy trying to bypass the Google verification lock.
    06-17-2018 11:21 PM
  16. Norg's Avatar
    I've been attempting to downgrade from an early 8.0 back to stock 7.0 for my S8+ for more than a week, at least 25 attempts using ODIN3 latest and ALWAYS ENDS WITH FAIL?? I have what I think are the correct codes for my AT&T s8+ "G955USQU1AQC9_G955UOYN1AQC9_ATT" downloaded from Sammobile. And Yes, I have latest Samsung drivers, good cable, that sort of thing...

    DOES ANYONE HAVE ANY IDEA WHAT I CAN DO NEXT, I'M REALLY OUT OF CREATIVE OPTIONS!!! HELP PLEASE!!!
    I'm simply doing this so I can return to receiving the regular AT&T carrier updates!! Surely one of you very knowledgeable people out there in Androidland can help a guy out?!
    06-18-2018 07:24 AM
  17. Norg's Avatar
    I've been attempting to downgrade from an early 8.0 back to stock 7.0 for my S8+ for more than a week, at least 25 attempts using ODIN3 latest and ALWAYS ENDS WITH FAIL?? I have was I think are the correct codes for my AT&T s8+ "G955USQU1AQC9_G955UOYN1AQC9_ATT" downloaded from Sammobile. And Yes, I have latest Samsung drivrs, good cable, that sort of thing...

    DOES ANYONE HAVE ANY IDEA WHAT I CAN DO NEXT, I'M REALLY OUT OF CREATIVE OPTIONS!!! HELP PLEASE!!!
    Finally gave up and requested a replacement S8+ under warranty.... All is back to normal, running official Oreo 8.0 and already received June Security patches, CASE CLOSED!!

    Lesson Learned; although I eventually managed to downgrade to an AT&T 7.0 version, my device never did regain the ability to receive AT&T ota updates. Agree or disagree, I suggest avoiding unnoficial software updates, the troubles and time wasted afterwards are simply not worth it!!
    06-25-2018 10:32 AM
  18. yoco007's Avatar
    Hey! I'm complete noob when it comes to this stuff. If it doesn't work, as it didn't for Norg above, does your phone become bricked?
    06-27-2018 07:00 AM
  19. Norg's Avatar
    Hey! I'm complete noob when it comes to this stuff. If it doesn't work, as it didn't for Norg above, does your phone become bricked?
    Not at all!! ...and if you do brick your phone you can unbrick it anyway. All I'm saying is that once you update to an unofficial version, you pretty well are stuck at updating that way going forward. To each their own!
    07-02-2018 11:08 AM
  20. Jeevan Budha Magar's Avatar
    Hi my note 8 is new zealand bought. Which stock firmware should i download to downgrade the phone from oreo to the official one. If its possible could you please send me the link and how to do it. Thanks
    07-27-2018 11:10 PM
  21. Norg's Avatar
    Hi my note 8 is new zealand bought. Which stock firmware should i download to downgrade the phone from oreo to the official one. If its possible could you please send me the link and how to do it. Thanks
    Based on my experience, once you update to an unofficial version, you're pretty well stuck at updating that way going forward. I spent many hours trying all sorts of ways being recommended to me some pretty savy users! In the end, I was never able to return to the original AT&T carrier version. You can certainly go back to Nougat, just not the carrier version!
    07-30-2018 10:31 AM
  22. KingKonga's Avatar
    Idk i just flashed mine oreo is awful nougat is so easy !!
    08-01-2018 11:34 PM
  23. JamesKsx's Avatar
    Apologies for duplicate message
    10-19-2018 08:13 AM
  24. JamesKsx's Avatar
    Grat article and help! I have been following to the letter on an S7 Edge, no luck, keep getting the Cm sw rev check fail device 3 binary 2 message. Any ideas what I'm doing wrong?
    Thanks!!
    10-19-2018 08:14 AM
  25. mark7914's Avatar
    As well as installing the earlier OS you'll also need to disable updates or it will probably begin nagging about them again before long. There are only so many times you can keep tapping "LATER" to dismiss the forced dialog box it throws up before you feel like getting a different phone as this one is then hard to live with.

    The "Developer Options" thing ("Auto Update System" = No) doesn't work, confirmed by Samsung - the settings will be ignored. There's also another setting which turns off Automatic Downloads. Again, confirmed - the setting is useless and will be ignored.

    You'll need to install BK Package Disabler and block a number of things including and especially "Software Update".

    This will indeed prevent the phone from looking for any further updates.

    There is a particular sequence you need to do this in. If anyone needs help let me know and I'll see if I can remember precisely how I managed it.
    10-19-2018 08:52 AM
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