I am trying to clone an existing BBB, so my first try is using the scripts 
on http://elinux.org/BeagleBone_Black_Extracting_eMMC_contents .  So first 
thing I notice is the .img file created was only 2GB, whereas this is a 
newer BBB that has 4GB eMMC.  So when I updated script to write the img to 
new BBB, it no longer boots from eMMC.  i would like to make exact copies 
including uENV.txt, etc.  Does anyone know why this is not working?

The read command script is 

#!/bin/sh
echo timer > /sys/class/leds/beaglebone\:green\:usr0/trigger 
dd if=/dev/mmcblk1 of=/mnt/BeagleBoneBlack-eMMC-image-$RANDOM.img bs=10M 
sync
echo default-on > /sys/class/leds/beaglebone\:green\:usr0/trigge

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