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[GUIDE] Soft-bricked after towel root, or just looking to downgrade, or start over?

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shortydoggg
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(Last edited by shortydoggg; 13th July 2014 at 06:09 PM.)
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Default [GUIDE] Soft-bricked after towel root, or just looking to downgrade, or start over?

THE CORRECTED VERSION:

(Note this guide is mostly for Windows based computers and may not work on a Mac).

For those who've soft bricked their s5 after towel root, or just looking to downgrade (to enable the download booster fix for example, or just want to start over), and who are on firmware G900AUCU2AND3, this is a brief guide, as I don't have the time of day to make a full step by step guide.
1. You're going to need the firmware from this thread. Only use the first file download. The other, as well as the ones from Samsung-updates and Sammobile will not work.

http://forum.xda-developers.com/show....php?t=2714455

or you can use the link from davew41 given here

http://www.mediafire.com/download/7n...2+Firmware.rar


2. You'll need to extract these files. You'll likely need winrar to extract the files.

The .rar file contains 4 different .tar files The BL file is for the bootloader, the AP is for the boot image, recovery, and system, the CP is for the modem, and the CSC is for the cache.

3. You are going to need Odin 3.09.

http://www.mediafire.com/download/vw...din3_v3.09.zip

4. If you are doing a full downgrade, starting everything new with a factory reset, then you will need all of the files, except the BL file. BL for sure will not work, because you already have that bootloader.
You need to boot into download mode. You have to flash the AP_G900A file in AP, The CP_G900A file in CP, and the CSC_ATT_G900A in CSC. It's best to flash all three files at the same time. Make sure only Auto Reboot and F. Reset time are checked. Once the phone reboots after Odin, the operating system is downgraded back to the previous one. You will temporarily loose root (until you re-root), and your phone will be factory reset because of the CSC_ATT_900A file. The phone, minus the bootloader, will be in the exact state that it was in from the UCU1ANCE firmware, so that it is easily rooted again as well as upgraded back up again.

5. If you are looking to downgrade, but want to keep your userdata without a factory reset, then you will only need the AP_G900A file.
You only need to flash the AP_G900A file in AP. Make sure only Auto Reboot and F. Reset time are checked. Once the phone reboots after Odin, the operating system is downgraded back to the previous one. You will temporarily loose root (until you re-root), and your phone will not lose any of its userdata. The phone, minus the bootloader, will be in about the state that it was in from the UCU1ANCE firmware, so that it is easily rooted again. The disadvantage, if you want to call it that, is that the phone will not be upgradeable through OTA updates. That can be fixed at a later date by following step 4.

Note: If there was a factory reset before, or probably after this step, you might get some strange things in your operating system since you only flashed the AP file, like a different keyboard, and a mobile data toggle in the notification which I actually liked. Also, your APNs will probably get wiped and you will have to re-enter them manually:

Name: ATT Phone (Some might have PTA in place of Phone)
APN: phone
Proxy: Not set
Port : Not set
User name: Not set
Password: Not set
Server: Not set
MMSC: http://mmsc.mobile.att.net
MMS proxy: proxy.mobile.att.net
MMS port: 80
MCC: 310
MNC: 410
Authentication type: None
APN type: default,mms,supl,hipri,fota
APN protocol: IPv4
APN roaming protocol: IPv4
Enable/disable APN: APN enabled
Bearer: Unspecified

6. If you are looking to recover from a softbrick, but are not looking to loose your userdata, then your only need the AP_G900A file.
You only need to flash the AP_G900A file in AP. Make sure only Auto Reboot and F. Reset time are checked. Once the phone reboots after Odin, the operating system is downgraded back to the previous one. You will temporarily loose root (until you re-root), and your phone will not lose any of its userdata. The phone, minus the bootloader, will be in about the state that it was in from the UCU1ANCE firmware, so that it is easily rooted again. The disadvantage, if you want to call it that, is that the phone will not be upgradeable through OTA updates. That can be fixed at a later date by following step 4.

Note: If there was a factory reset before, or probably after this step, you might get some strange things in your operating system since you only flashed the AP file, like a different keyboard, and a mobile data toggle in the notification which I actually liked. Also, your APNs will probably get wiped and you will have to re-enter them manually:

Name: ATT Phone (Some might have PTA in place of Phone)
APN: phone
Proxy: Not set
Port : Not set
User name: Not set
Password: Not set
Server: Not set
MMSC: http://mmsc.mobile.att.net
MMS proxy: proxy.mobile.att.net
MMS port: 80
MCC: 310
MNC: 410
Authentication type: None
APN type: default,mms,supl,hipri,fota
APN protocol: IPv4
APN roaming protocol: IPv4
Enable/disable APN: APN enabled
Bearer: Unspecified

7. If you are are looking to recover from a softbrick, but want to start everything new with a factory reset, then you will need all of the files, except the BL file. BL for sure will not work, because you already have that bootloader.

You need to boot into download mode. You have to flash the AP_G900A file in AP, The CP_G900A file in CP, and the CSC_ATT_G900A in CSC. It's best to flash all three files at the same time. Make sure only Auto Reboot and F. Reset time are checked. Once the phone reboots after Odin, the operating system is downgraded back to the previous one. You will temporarily loose root (until you re-root), and your phone will be factory reset because of the CSC_ATT_900A file. The phone, minus the bootloader, will be in the exact state that it was in from the UCU1ANCE firmware, so that it is easily rooted again as well as upgraded back up again.


Thanks to davew41 and pcidiot for doing some of the things that I initially did not have time to do.

---------------------------------------------------------------------------------------------------------------------------------------------------------------
THE ORIGINAL VERSION AND ORIGINAL EDIT: (so the previous comments won't become confusing)

For those who've soft bricked their s5 after towel root, and who are on firmware G900AUCU2AND3, including myself, we could all use the G900AUCU2AND3 firmware, which unfortunately is not available right now to the public.

I don't have the time of day to make a full step by step guide, but here are the steps that I did to get my phone back running. It's not perfect, and does not bring the phone back exactly to how it was, but it is an emergency fix for if you need the phone right away.

1. You're going to need the firmware from this thread. Only use the first file download. The other, as well as the one from Samsung-updates and Sammobile will not work.

http://forum.xda-developers.com/show....php?t=2714455

2. You'll need to extract extract the files.*

3. You are going to need Odin 3.09. 3.07 may work as well. You will need the AP_G900A file only. BL for sure will not work, and I have not tried the other 2 files yet.

4. You need to boot into recovery and do a factory reset. Then you need to boot directly into download mode, and not into the operating system.

5. You have to flash the AP_G900A file in AP, or PDA with ODIN, depends on whether it's 3.07 or 3.09. Make sure only Auto Reboot and F. Reset time are checked.

Once my phone rebooted after Odin, the operating system was downgraded back to the previous one. I lost root access, as well as gaining some other things that I do not like, like the keyboard. I also gained a mobile data toggle for some reason (Maybe I had it previously, but don't remember it). I was able to easily re-root the phone, and I also had to re-enter my APN settings, as those were also wiped which killed my mobile data connection.

Like I said, it's an emergency fix. It's not perfect. If it does work for you, your phone for now will be stuck on the previous operating system until there is a ROM to flash or a new OTA, as there is no current firmware to flash, and the current OTA will also fail because you still have the same bootloader as the one you're trying to update to.

ORIGINAL EDIT: It has now been discovered that three of the four files, AP, CP, and CSC do indeed work. You have to flash them separately one at a time; flash one, reboot, then flash the next. You will temporarily loose root, and the last one, CSC, will factory reset your phone. Also the OTA now works after flashing all three files, so we are now all good.*

Thanks to davew41 and pcidiot for doing some of the things that I initially did not have time to do. I will re-edit this post later.
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NotDavid
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(Last edited by NotDavid; 17th June 2014 at 12:15 AM.)
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Last I checked, you were suppose to also add the other files into odin as well (BL, CSC, etc). If you did that, than your mobile data will not work. Turn off your wifi and check if your mobile data works. Apart from that, you may be on to something if you got from ND3 to the original stock firmware. I'll double check and see if it works.

Edit:

Didn't read entirely. Lmao basically repeated everything OP posted. Thanks for the FIX.
 
shortydoggg
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Quote:
Originally Posted by NotDavid View Post
Last I checked, you were suppose to also add the other files into odin as well (BL, CSC, etc). If you did that, than your mobile data will not work. Turn off your wifi and check if your mobile data works. Apart from that, you may be on to something if you got from ND3 to the original stock firmware. I'll double check and see if it works.

Edit:

Didn't read entirely. Lmao basically repeated everything OP posted. Thanks for the FIX.
BL failed. I didn't try CSC and and CP because I didn't want a mismatch with the bootloader and modem. My mobile data is fine now after entering a new APN. My Hotspot still works too.
 
NotDavid
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Do you think you can update to ND3 via Samsung Kies? Samsung kies doesn't allow you to reinstall the firmware but it does allow for upgrades. Just asking because I might try it out soon. I didn't soft brick my phone but deleted a few stock apps I shouldn't have and I kinda gotta go to ATT later this week.
 
shortydoggg
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Quote:
Originally Posted by NotDavid View Post
Do you think you can update to ND3 via Samsung Kies? Samsung kies doesn't allow you to reinstall the firmware but it does allow for upgrades. Just asking because I might try it out soon. I didn't soft brick my phone but deleted a few stock apps I shouldn't have and I kinda gotta go to ATT later this week.
Everyone else says it failed, but my software is different, downgraded, now. I'm going to try and see what happens.
 
NotDavid
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Quote:
Originally Posted by shortydoggg View Post
Everyone else says it failed, but my software is different, downgraded, now. I'm going to try and see what happens.
Yea dude please let me know. Also another suggestion (I did the same thing you did like 1 month ago, only used the AP instead off all the other ones like an idiot and lost mobile data and what not. Had to find another stock NCE and I found one that was simply an AP off sammobile and it fixed everything. you should try to odin that stock with your current software).
 
pcidiot
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Quote:
Originally Posted by shortydoggg View Post
Everyone else says it failed, but my software is different, downgraded, now. I'm going to try and see what happens.
How do you get just the AP file? Sorry for the Newby like question. but I followed the Sammobile site and it failed on me. I am downloading again and will be trying as soon as it is done. I have slow internet speeds so it will be a while.
 
kwikrat
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Quote:
Originally Posted by pcidiot View Post
How do you get just the AP file? Sorry for the Newby like question. but I followed the Sammobile site and it failed on me. I am downloading again and will be trying as soon as it is done. I have slow internet speeds so it will be a while.
Use Winrar to extract all the files. The above mentioned solution is working flawlessly for me.
---I think I need to join flashaholics anonymous
AT&T Galaxy S5 on Dynamic Kat
 
pcidiot
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Originally Posted by kwikrat View Post
Use Winrar to extract all the files. The above mentioned solution is working flawlessly for me.
can I take the files from Sammobile or will they not have the right one? If not I will be waiting to see if it works for me. 2 hours to download, slow internet and to many people on it.
 
shortydoggg
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Quote:
Originally Posted by pcidiot View Post
can I take the files from Sammobile or will they not have the right one? If not I will be waiting to see if it works for me. 2 hours to download, slow internet and to many people on it.
I'm not sure. I'm downloading them too to see what they are. I currently have two different ones from two different sites.

Tags
4.4.2, g900aucu2and3, s5 downgrade, soft brick, towel root
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