Is it impossible to flash an AOSP rom on a rooted AT&T S5 Active?

Hello!

I've done some reading and having not gotten a satisfactory answer I thought I'd throw my question out to the community.

I'm currently running Twisted Lollipop v7.

I can Odin back to stock 4.4.2 whenever and redo towelroot and install safestrap etc.

I've been unsuccessful at flashing an AOSP rom and wanted to confirm once and for all if it is truly impossible to flash Blisspop or Cyanogenmod or Sonic or any of those I enjoyed on my trusty old S3 onto my unlocked At&T S5 Active.

If it is not possible I will get rid of this unlocked AT&T S5 active and get a used what? The T-mobile variant? The international variant? I just want to be able to flash whatever the hell I want without too much hassle! I do like the phone other than that though!

Looking forward to any advice!

Thanks!

Edbogue

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Impossible to connect me to android market even with google account

Hi everybody
I own a Sony Ericsson Xperia X10i.
For almost 2 years I am not connected to the Internet with me.
I updated with PC Companion 2.1
android version 2.3.3
Baseband Version: 2.1.71
version of the nucleus: 2.6.29
build number: 3.0.1.G.0.75
Wishing to upgrade the android version 4 or 5, I wanted to download Root Checker Basic to see if my phone was ROOTED because I have read that when the phone was unlocked (I changed of operator company and I gave it to unlock) this meant that he was ROOTED
Unable to connect me to Android Market asks me to add a google account.
When I log into my gmail account and I want to download this application I have message on the phone create a new account or login with an existing account: so connecting to gmail withe my IDs and after a message saying " your phone has to communicate with Google servers it may take up to 5 minutes" and then I have the following final message: UNABLE TO ESTABLISH A RELIABLE DATA CONNECTION WITH THE SERVER, YOU MAY NOT GET THE DATA SERVICE WITH YOUR PHONE.
I tried to download Root Checker Basic from a site but once I doubled click on the download I had a message like "error code".
CONCLUSION: I can connect to my google account but every time I want to download something that is impossible.(and I am connected to Internet with wifi)
Thanks for your help. Best regards.
Thank you very much for your help.

jfltecan: Is that really impossible to downgrade from KK to JB? Can someone confirm?

Hi,

I have experience with the Canadian S4 I337M, currently running custom Validus ROM 5.1.1, originally was on TouchWiz 4.4.2;
I have altough a question that seems quite.. debated, did looked around I can't find a definitive answer and know who I should trust. I wonder if options changed in 2015 rather than 2013 when KNOX was still new.

Out of simple curiosity (I will not attempt it, risky, probably useless and I'm running 5.1.1 anyway): I keep reading that it's impossible to downgrade the S4 to 4.2.2, due to the KNOX bootloader on 4.3 / 4.4, I understand that you cannot downgrade below 4.3 which is the "new" KNOX bootloader.

1. I'm simply curious: On the I337M, what happens if you grab the stock 4.2.2 firmware and flash it with Odin anyway, considering I'm on 4.4 ? My guess, if I'm correct, Odin detect the bootloader version right away and says "FAIL". Correct?

2. I used to think it was possible to downgrade from 4.4 to 4.3, since 4.3 has the KNOX bootloader as well. Is this possible anyway, or will Odin fail (Not going to try it, not worth it)? Considering what I've read just today, 4.4 is also a new bootloader. In any case, since that 4.4 bootloader cannot be downgraded (I guess?), there is no way to downgrade from 4.4 to stock 4.3 either? Odin will show "FAIL" ?

3. Is there any other way to downgrade it anyway? I understand that KNOX 0x1 remain irreversible yet, and to my knowledge, it's impossible to dowgrade to 4.2.2 (Or even 4.3?), but I've been reading that it was possible to downgrade if the bootloader is excluded from the TAR archive, make sense to me, but is that true, was that patched? Should I recompile an ODIN package excluding the bootloader, is that how it's done (Too dangerous, not trying it)? Or maybe by using Mobile Odin / FlashFire, downgrading from 4.4 to 4.3 / 4.2 can be acheived, if the bootloader is left untouched? What happens if we try it anyways? Odin fail, or device does boot but doesn't get past Samsung boot logo?

I'm just wondering, and quite confused by the different opinions that were shared. Remember this is for the Canadian I337M variant.

Thanks for confirming, appreciate!