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Hi,
If you boot up your device from SD-card you are able to utilize basic linux-command ´dd´ to take backup of your android.
Something like this "# dd if=/dev/path/to/emmc conv=sync,noerror bs=64K | gzip -c -9 > /path/to//op_stock_android_img.gz". Of course you need to first figure out what is correct path for emmc and where to store backup image. I would attach usb-stick to OP and store image there.
Br,
-miha
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