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Help Help - i9505g soft-brick/boot-loop

This is my second Samsung. I have put over a dozen different ROMs on my old Exhibit II 4G. Having said that, I realize many of you know more than I could ever hope to know. That is why I'm posting here.

I've had a Samsung Galaxy S4 Google Play Edition for over a month and still did not have a nandroid backup, so last night I installed ClockworkMod ROM Manager (https://play.google.com/store/apps/details?id=com.koushikdutta.rommanager&hl=en) with the intention of flashing CWM Recovery. The app did not list my phone, so I told it to show all devices, where I found the i9505 (I don't remember if it was the i9505g or not). I told it to flash ClockworkMod Recovery, and selected the option that I had not yet flashed CWMR. I then used QuickBoot (https://play.google.com/store/apps/details?id=com.siriusapplications.quickboot) to reboot into recovery, where I performed my first nandroid to the microSD card.

When I rebooted after making that nandroid, it went right back to ClockworkMod Recovery. Subsequent reboots did the same thing. I could get into Odin mode with VolumeDown+Home+Power. Using Odin v3.09 I was able to flash the stock recovery. This did not resolve the boot-loop issue. Now it boots into the stock recovery, which is less functional than CWM. To me it is behaving as if the recovery tools were flashed to the /boot/ partition, or something is telling it to always boot from the recovery partition.

-In stock recovery, it will download ADB installations (from "apply update from ADB"), but every attempt fails it's signature verification. I have tried 6+ files, all have failed. I believe that the device has USB debugging enabled, but I cannot check while in this state.
-Stock recovery does not mount the microSD card, so I cannot install from there. CWM would mount the microSD card, but I did not think to try installs from the microSD at that time. Is it possible that I installed the wrong stock recovery?
-I do not know how to perform an ADB "push" with my phone in this state. To be honest, I have never done an ADB push. If I get to that stage, where on my S4 should I send a pushed file? "/system/bin"?
-If I try an adb push in this mode
-How do I get my phone to boot from the proper partition?
-If I have the wrong data in that partition, how do I get the correct information onto that partition?

Here is what it does when I try to sideload from stock recovery:
Finding update package...
Opening update package...
Verifying update package...
E:failed to verify while-file signature
E:failed to verify while-file signature
E:signature verification failed
Installation aborted

Thank you in advance for any help!
 
Re-root your phone and install a custom recovery by carefully reading and following the instructions in posts #1 - #4 of the Rooting Galaxy S4 - Dummies Guide. Do not use the kernels mentioned but instead, use the following i9505G root kernel...

CF-Root Download

You can also ignore the warning about Knox security as it does not apply to the Google Edition. You can also ditch ROM Manager and use Nandroid Manager and Online Nandroid Backup, as mentioned in the guide.

For future reference, the All Things Root section for the Google Edition is...

Galaxy S4 Google Edition - All Things Root - Android Forums
 
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