small Request for someone with rooted ATT LG G4

Hello everyone. I need a small BIG favor...someone with a rooted ATT/puertorico LG G4 please run this command

using adb shell terminal

Code:

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dd if=/dev/block/mmcblk0 bs=1 count=17408 of=/data/media/0/gpt_backup.img

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And post the file here. Trying to make to make a file to unbrick completely dead phone.

Thank you :)