Beaglebone Black Rev.C backup of eMMC failed

While fiddling with a Beaglebone Black Rev.C I run into a problem while trying to backup the eMMC content to external SD card. provides a description that I followed. However, when booting from SD card, I got only a short flashing USR0 LED and then a steady one. The resulting backup file BeagleBoneBlack-eMMC-image-XXXXX.img.gz was only 1kB in size with zero content.

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