Band 12 update failed.

Hi all,

I have a Tmobile ZTE 970 Build Z970V1.0.0B22. The device is on stock, rooted with TWRP installed.

I followed the instructions in the stock rom thread. I flashed the stock rom and flashed the stock recovery zip.

I then tried to update the phone with the Tmobile Band 12 update. The update failed. I tried several times, but it always failed.

What can I do to update my phone to Band 12? Thank you for your help.

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Band 12 update failed.