Rolling back 5.0 to 4.4 on C2 Baseband - AT&T Galaxy Note 3 Q&A, Help & Troubleshooting

I know there are other posts similar to this one, however they seem to be outdated (at least somewhat) for the reason below.
I have a Note 3 (N900A) I've been preparing to rollback to 4.4 following instructions found here.
However apparently AT&T has pushed out a new OTA that updated the baseband to N900AUCUE0C2.
I haven't been able to find any information on this update online in my searches. I was wondering if anyone knew if this update made it any more difficult to roll back or locked the bootloader in anyway.
Thank you in advance.

Related

How to downgrade ME572CL back to JP sku Kitkat from pre-rooted WW Lollipop

So I have a Japanese model ME572CL which I flashed with WW lollipop firmware. I then downgraded and reflashed with pre-rooted lollipop following the guide on here. But now I would like to go back to the correct JP SKU firmware, the most recent version of which is V12.14.1.17 released last month, but I believe still 4.4.2 based. Can anyone tell me the correct steps to downgrade back to that firmware? Really grateful if anyone can help!
Sorry, please ignore this thread. I managed to get it done by myself and found that JP12.14.1.17 is infact lollipop. And there was an OTA update to JP12.14.1.19 too. So all good, now on Lollipop and Japanese. No way to root it, but nevermind.

AT&T MM current status...?

Hi everyone,
Just got a used S5 from ebay and it's a carrier unlocked AT&T model (I'm in the UK). I've successfully upgraded to Marshmallow using Odin and was looking at root options. I've done some looking around the forums and just wanted to check if I was understanding the situation properly:
1) Are the AT&T models impossible to bootloader unlock?
2) If this is true then I guess any ROMs other than stock based are out of the question?
3) Is it not possible to have root on MM? Is this just because it hasn't been done yet, or is there something inherent in MM that makes it impossible?
4) Therefore, it's only possible to have rooted s5 on LP? And only ROMS based on LP are available?
Thanks in advance !
How did you update the firmware, since i'm having an AT&T S5 with 5.1.1 on it (G900AUCU4COI5), and when searching for updates it's always telling me that there are no updates available, although i'm sure that there are at least 10 mini-patches and patches (5.1.1 -> 6.0).
@tooplanx
Your assumptions are correct. There is an encryption key that has the bootloader locked down and only the carrier can release it. Most Samsung US variants are notorious for this. So yes only stock ROM or a 5.0 based custom ROM is available. Root could be possible through a security exploit on MM (especially since its security patches are now 6 months out of date) but I don't think any developers are working on it that I know of as most of them have moved onto other devices and variants. So at this time yes it is only possible to have root on 5.0.
@Cornul11
Are you using a working AT&T sim card when checking for the update? It won't appear when using another network.
Cornul11 said:
How did you update the firmware, since i'm having an AT&T S5 with 5.1.1 on it (G900AUCU4COI5), and when searching for updates it's always telling me that there are no updates available, although i'm sure that there are at least 10 mini-patches and patches (5.1.1 -> 6.0).
Click to expand...
Click to collapse
Unless you have an AT&T working sim, you will need to install the upgrade with some software called 'Odin' and the manually downloaded stock 6.0 ROM for the G900A. Kies doesn't work either.
Have a look for 'Odin upgrade' in these forums, it should be easy enough to find.
chin'ah.girl said:
@tooplanx
Your assumptions are correct. There is an encryption key that has the bootloader locked down and only the carrier can release it. Most Samsung US variants are notorious for this. So yes only stock ROM or a 5.0 based custom ROM is available. Root could be possible through a security exploit on MM (especially since its security patches are now 6 months out of date) but I don't think any developers are working on it that I know of as most of them have moved onto other devices and variants. So at this time yes it is only possible to have root on 5.0.
@Cornul11
Are you using a working AT&T sim card when checking for the update? It won't appear when using another network.
Click to expand...
Click to collapse
tooplanx said:
Unless you have an AT&T working sim, you will need to install the upgrade with some software called 'Odin' and the manually downloaded stock 6.0 ROM for the G900A. Kies doesn't work either.
Have a look for 'Odin upgrade' in these forums, it should be easy enough to find.
Click to expand...
Click to collapse
I don't have an AT&T sim card, so no updates were being shown as available for me. I downloaded the firmware and installed it using ODIN, now i have the latest available version which is G900AUCS4DQD1 (6.0.1).

Stuck on N950USQU3CRB1

Hi All,
I was hoping someone could point me in the right direction.
I have an unlocked Note 8 (Model SM-N950U1) that I flashed a version of Verizon 8.0.0 to (N950USQU3CRB1). I've looked around the forums quite a bit and can't seem to find any way to go back to my original unlocked software. Ideally, I'd like to be on the most current version, but I'm not sure how to get there.
Any ideas?
Thanks in advance for your help!
There's two threads called carrier switching that deal with this in great detailed guides.
The abbreviated version is, download the N950U1 fimrware with SamFirm.
Flash it with patched ODIN 3.13.1_3B
Just advice, next time before you flash firmware on your phone, make sure you understand the procedure for.goijg back to stock as well.

Trouble updating Galaxy Note 9

Hi i am new here and need help with updating my Samsung note 9 i still have a baseband N960USQS1ARI5 but will like to update to the latest firmware. i'm using an unlocked AT&T phone. can anyone guide me? I'm not sure if updating the firmware will lock the phone and the process to update, do I just update the firmware in stages as the updates were released till i get to the latest update or can i update straight up to the latest? I am thinking of using Odin, is that a safe way to do this? any help will be appreciated. Lastly, can I change from the AT&T firmware to lets say a none carrier based firmware so as to stop seeing the AT&T logo on boot up? Maybe switch to a firmware that supports global or international? Does anyone have links to an unlocked firmware update i can use, as well? Please help!
I must state that the phone never updates automatically as it always says the software is up to date.
mtrackerbeyond said:
Hi i am new here and need help with updating my Samsung note 9 i still have a baseband N960USQS1ARI5 but will like to update to the latest firmware. i'm using an unlocked AT&T phone. can anyone guide me? I'm not sure if updating the firmware will lock the phone and the process to update, do I just update the firmware in stages as the updates were released till i get to the latest update or can i update straight up to the latest? I am thinking of using Odin, is that a safe way to do this? any help will be appreciated. Lastly, can I change from the AT&T firmware to lets say a none carrier based firmware so as to stop seeing the AT&T logo on boot up? Maybe switch to a firmware that supports global or international? Does anyone have links to an unlocked firmware update i can use, as well? Please help!
I must state that the phone never updates automatically as it always says the software is up to date.
Click to expand...
Click to collapse
to your last point, at&t phones are notoriously bad at updating
factory unlocked phones will remain forever unlocked and phones unlocked that are bespoke to a specific carrier will also remain unlocked even with Odin flashes providing that the method employed to unlock it was legitimate. Some unlock methods employ root and only trick the phone into thinking its unlocked. Well, once you remove root, and thusly the trick, the unlock is gone. I have ran across rare examples where the person swore up and down that they unlocked their phone with a legit unlock code and that it relocked to a carrier once the sim was inserted and initial programming completed, but i dunno. Sounds weird to me, but every person who said this also said that the phone locked to a carrier other than the one it came from originally. Take that for what its worth, but i still mostly stand by the first couple lines of this section of my diatribe
If you want the at&t crap gone, get the N960U1 firmware and flash it in Odin. You will need the modified version of Odin to flash it so it can ignore the 255 errors the phone throws up from flashing firmware for a carrier (or, in this case, no carrier) on to a phone that it wasnt originally designated (not designed) for
go to sammobile.com/firmwares, get the info for the firmware you want to d/l, get the Frija tool or Samfirm and download the firmware thru one of those as theyre literally 5x faster and flash it
mtrackerbeyond said:
Hi i am new here and need help with updating my Samsung note 9 i still have a baseband N960USQS1ARI5 but will like to update to the latest firmware. i'm using an unlocked AT&T phone. can anyone guide me? I'm not sure if updating the firmware will lock the phone and the process to update, do I just update the firmware in stages as the updates were released till i get to the latest update or can i update straight up to the latest? I am thinking of using Odin, is that a safe way to do this? any help will be appreciated. Lastly, can I change from the AT&T firmware to lets say a none carrier based firmware so as to stop seeing the AT&T logo on boot up? Maybe switch to a firmware that supports global or international? Does anyone have links to an unlocked firmware update i can use, as well? Please help!
I must state that the phone never updates automatically as it always says the software is up to date.
Click to expand...
Click to collapse
Hi, my phone is a Note 9 ATT factory unlocked.
Below is the link for my post
I've updated my phone using the link , and still unlocked and working Ok.
I hope it can help you .
https://www.google.com/amp/s/forum....note-9-att-rom-update-sept-2019-t3979303/amp/

S8 Active Downgrade

Hello,
If this is in the wrong area, please forgive me. I tried my best to make sure it is in the right area, and I'm not super familiar with this site (though I've read here from time to time!)
A long time ago, my S8 Active upgraded to Pie, and I downgraded because I didn't like it at all. Well, I hard-reset my phone last week and I forgot to disable the update feature, and I have Pie again. So I want to downgrade again. However, using the firmware from sammobile.com and the latest Oreo firmware, Odin3 gives me a generic "failed" error. I suspect it's a bootloader version issue, but I really don't know enough about this to know for sure. My current firmware is G892USQU7CTG2 (T-Mobile). Is that bootloader version 7? If so, I think I'm screwed because, as I understand, you can't downgrade to a firmware with an older bootloader version... is that correct? The newest version of Oreo is G892USQS5BSG4, which I think is bootloader 5. If my understanding is correct, then... is there any way to downgrade the bootloader on my phone? I really really don't want Pie.
Thanks for your time and (hopefully) good news!

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