Rev. C boards from Element14
This is the thread's initial revision.
First, thanks for this incredibly useful tool - I use it all the time! I recently got some Rev. C boards from Element14 and the tool stopped working. It appears to be a change in the U-Boot.img on the EMMC. If you are having this problem and save-emmc isn't loading automatically when you insert the SD card you may be able to work around it by mounting the card and creating a directory called 'dtbs' and copying the file named am335x-boneblack.dtb into that directory.
More detail can be found here: http://www.element14.com/community/message/136214/l/re-bbb-s2-user-boot-button-not-working-on-element14-board
I learned a lot about this process here: https://www.marshut.net/irqnmm/changing-bbb-boot-default-from-emmc-to-usd.html