[BBB] can't install Angstrom (or any alternative OS)

Hi, I have a Beaglebone Blacl and I can’t update Image.

I download https://s3.amazonaws.com/angstrom/demo/beaglebone/BBB-eMMC-flasher-2013.06.20.img.xz unxz the file and I dd the .img to my sd card but I have no result
After, I try to flash internal memory using sd card https://www.youtube.com/watch?v=2tdKHuNnSOw&feature=youtu.be

Thank you !