[Shield Tablet General] pt79:
I got a cheap ATT LTE Shield from ebay and was hoping I could run stock firmware.

I checked http://shield.bogdacutu.me/ yesterday and got Next OTA: SHIELD Tablet Software Upgrade 3.1.1 - WiFi

Below is the procedure I did, and I have yet to turn on the wifi or LTE (no SIM at least).

However reading the rest of this thread it looks like Nvidia will still find and at least stage that your shield will be deactivated.

At this time it is unknown what is triggering the detection or if Nvidia can actually still kill remote if you have remove TegraOTA.

Current assumption from this thread is that using http://shield.bogdacutu.me/ is alerting Nvidia

Preperation

- Charge tablet

- Backup/Export important data from your tablet

Reset Tablet

- On Tablet > Settings > Backup & reset > factory data resetreset

- After reset, go thru setup and leave everything unchecked/default and dont connect to LTE or Wifi

Start official recovery image download (couple gigs)

https://developer.nvidia.com/gameworksdownload

Download and install USB drivers for shield

https://developer.nvidia.com/gameworksdownload

Download and install minimal adb fastboot

http://xdaforums.com/showthread.php?t=2317790

Download latest TWRP img

https://dl.twrp.me/shieldtablet/

Download NoMoreOTA

http://xdaforums.com/shield-tablet/general/kill-kill-switch-shield-tablet-xx-t3179489

This does the following (text from script)

mount("ext4", "EMMC", "/dev/block/platform/sdhci-tegra.3/by-name/APP", "/system");
delete("/system/app/TegraOTA.apk");
delete("/system/priv-app/TegraOTA.apk");
delete_recursive("/system/app/TegraOTA");
delete_recursive("/system/priv-app/TegraOTA");
ui_print("Deleted TegraOTA");

Step 1

Install the minimal adb fastboot and go to command prompt where it is installed

- Unzip the minimal adb fastboot and run installer exe.

- Tell it to install somewhere easy to get to, I did C:\minimalADB

Step 2 - Put your tablet in developer mode

- On tablet> Settings > About Tablet > Click Build Number until it activates developer mode

- On tablet > Settings > Developer Options > USB debugging = ON

Step 3 - Confirm your PC sees tablet

adb devices

You should get a prompt on device to allow this on the tablet

You should then get an output in the command prompt showing that your PC can see the device.

Run the command a second time to confirm

Step 4 - Boot to bootloader

At command prompt type

adb reboot bootloader

Step 5 - Get your images ready

- Unzip the twrp you downloaded to where you installed minimal adb and fastboot

- Unzip the nvidia recovery image you downloaded to where you installed minimal adb and fastboot

- Place nomoreota.zip ( do not unzip) where you installed minimal adb and fastboot

Step 6 - Install new firmware

At command prompt type these commands consecutively

fastboot flash boot boot.img
fastboot flash system system.img
fastboot flash userdata userdata.img
fastboot flash staging blob
fastboot flash recovery twrp-XXXXXXX.img

Step 7 - Copy nomoreota to tablet

At command prompt

adb push nomoreota.zip /sdcard/Download/

Step 8 - Remove the tegra OTA stuff

- On tablet use volume keys to go to Recovery option and press power key to enter it

- On tablet in TWRP go to install and select & install the nomoreota.zip

- On tablet in TWRP go to file explorer and confirm that none of the TegraOTA files or folders are around

- On tablet in TWRP reboot to system

Step 9 - Confirm you do not have TegraOTA active

- On tablet go to settings > about tablet > system updates. You should have a blue system updates screen

Step 10 - Cry

- noTegraOTA may not be sufficient to avoid Nvidia marking your Tablet to be killed

- noTegraOTA may not be sufficient to avoid Nvidia killing your tablet if you are using the stock image

Step 11

Go load a custom ROM because this seems to be only for sure way to keep your tablet active.

I am now off to read what custom ROM works the best

My Assumptions from reading thread...

- if the Replacement-Shield did not do noTegraOTA maybe it is triggering the Nvidia-Kill-Marking

- if you use http://shield.bogdacutu.me/ Nvidia may be watching and triggering the Nvidia-Kill-Marking

- If you use stock image their current method using TegraOTA to OTA kill your nvidia will not work for nvidia, but Nvidia may have an unknown-to-us method or find a new method, so you are at risk regardless of what you do if you use the stock image.

- safest thing to do is run a custom image