Softbricked AT&T Galaxy S5

I purchased a soft bricked sm-g900a phone off of Ebay with the idea of using Odin to reflash and recover the phone. Since the phone was purchased soft bricked I do not have a history on what firmware was running on the phone or what the previous owner flashed that may have caused the phone not to boot to the OS or into recovery. I am assuming the previous owner was on 5.0 and tried to downgrade and ran into problems.

Short description of the current state of the phone:
1. Phone will boot into Odin Mode and can be flashed using Odin.
2. Phone will start to boot to recovery but sticks at "Recovery Booting. . . ." and reboots after about 30 seconds
3. Phone boots to Samsung logo and reboots after about 30 seconds.

What works:
Using Odin I can flash the following without errors: After flashing the phone exhibits the behavior above.

1. G900A_OC4_Stock_Kernel.tar.md5,


2. G900A_OA1_Stock_Kernel.tar.md5


3. G900A_OC4_Stock_Modem.tar.md5,


4. G900A_OC4_Stock_Partitions.tar.md5


5. G900AUCU3BOC4_OneClick..exe - reboots to recovery and "Recovery Booting. . . ."


6. I can flash SM-G900A_pit.pit with Odin 3.07 but not 3.09 or 3.10.

What does not work.
Tried flashing G900A_Downgrade_to_NCE.tar.md5 - Odin reports error
<ID:0/005> system.img.ext4
<ID:0/005> FAIL! (Auth)
Phone reports errors
SYS REV CHECK FAIL[S] :Refer 2> Binary 1
SECURE CHECK FAIL : System

Tried flashing SM-G900A 4.4.2 G900AUCU1ANCE Firmware - AP_G900AUCU1ANCE_964333_REV00_user_low_ship_MULTI_ CERT.tar.md5 in AP slot
Same errors as above .

Tried to use Kies to recover the phone. It goes through the process of recovering with 4.4.2 and crashes about the same place flashing wit Odin does.

I assume if I could get into recovery to do a factory wipe I would be able to get the phone to boot. I have read multiple forum posts and blogs on getting the bricked phone to work where most recommend flashing G900A_Downgrade_to_NCE.tar.md5 and then if you can't get into recovery to flash either G900A_OC4_Stock_Kernel.tar.md5 or G900A_OA1_Stock_Kernel.tar.md5 and then you should be able to get into recovery. This of course has not worked for me.

Does anyone have any idea how I might go about getting this phone to boot into recovery? Also is it possible to have the local AT&T store re flash 5.0 on the phone.

I know it is a risk buying soft bricked phones but I sure would not like to have an expensive paper weight.