Root Accidentally updated my rooted AT&T SM-G900A S5. What do I do?

[AppleCultApost8]

I accidentally uploaded the firmware on my rooted AT&T SM-G900A that just came out today. You can call me stupid, moron, or whatever I don't care. But I want to know if there is a way I can downgrade my firmware to stock version. If not, is there a way I can manually root the new firmware? I'm good with command line and I program stuff too so no tutorial will be too technical or complicated for me. So can anyone please help?

 

[BRAINZ2013]

You can but its some work with

http://www.sammobile.com/firmwares/

 

[emerilnut]

I updated as well... or should I say, the phone automatically updated for me. I was postponing the upgrade, but then on Sunday afternoon, it just did it, wouldn't let me cancel out, but just upgraded. MEH!!!

Confirmed that root was broken. Tried to rerun TR, but it said incompatible firmware.

 

[astronautlevel]

I'm in the same boat. Any suggestions?

 

[BRAINZ2013]

I'm in the same boat. Any suggestions?

I posted a way I guess I let this show and tell

How to Flash Stock Firmware for Galaxy S5 [All Va

 

[astronautlevel]

I posted a way I guess I let this show and tell

How to Flash Stock Firmware for Galaxy S5 [All Va

 

[BRAINZ2013]

No remove SD card to be on safe side

 

[astronautlevel]

No remove SD card to be on safe side

I've successfully downgraded and re-rooted. How do I stop my phone from updating or keep root upon update?

 

[BRAINZ2013]

Are you rooted with a ROM or just rooted with stock. Either way a rooted device may still get update from carrier and break the root

 

[astronautlevel]

Are you rooted with a ROM or just rooted with stock. Either way a rooted device may still get update from carrier and break the root

Rooted with stock. Would the survival mode in SuperSU work?

 

[BRAINZ2013]

Rooted with stock. Would the survival mode in SuperSU work?

It may and may not feel free to try glad to see someone else uses SUPERSU. I thought I was the only one

 

[silentwitness]

you should be able to go to settings and about and disable auto update.

 

[astronautlevel]

you should be able to go to settings and about and disable auto update.

Under about I see software update but no way to disable auto updates

 

[silentwitness]

i think this is the same setting

Go to Settings/Security/Security policy updates/ and UN-TICK "Automatic updates"

 

[astronautlevel]

i think this is the same setting

Go to Settings/Security/Security policy updates/ and UN-TICK "Automatic updates"

Yep, thanks!

 

[emerilnut]

I'm trying to get back to the last version using the sammobile/Odin 3.09 method, but I'm stuck on the damn thing failing at NAND write start >> Fail (Auth) part.

The good news is that it doesn't brick the phone. when I reboot, the phone's fine.

I don't know what to do next. I didn't find anything useful as far as tips on what to do to fix the nand write start fail thing. I googled for a couple of hours.

 

[BRAINZ2013]

You must not have chosen the correct firmware for your device

 

[emerilnut]

I'm pretty sure I did. SM-G900A since I have an AT&T S5.

The one thing I didn't try, among all the different cables and different USB ports, was trying another computer. I'll try that when I have another pocket of time.

 

[BRAINZ2013]

You will need the correct one so I hope you have the firmware info and the downgraded information correct

 

[ANDrewROID]

Has anyone actually successfully downgraded their Lollipop G900A back to KitKat? I've been investing a lot of my time trying to figure this out in order to root my phone.

 

[ANDrewROID]

I've successfully downgraded and re-rooted. How do I stop my phone from updating or keep root upon update?

Hello, I'm also looking into downgrading my phone, and I have one question:
Is your phone an AT&T model?

 

[ironass]

Has anyone actually successfully downgraded their Lollipop G900A back to KitKat? I've been investing a lot of my time trying to figure this out in order to root my phone.

Hello and welcome to Android Forums ANDrewROID!

If you have the AT&T carrier minority variant, Galaxy S5, SM-G900A, and are on the latest AT&T version of Lollipop firmware, OF3, you will no longer be able to downgrade to KitKat or root your phone thanks to their new mega locked down bootloader.

See #1.6 of 41 Galaxy S5 models - Dummies Guide for more details.