Appendix A. Installing a Fresh Operating System Image
The BeagleBone comes pre-installed with Debian, but if you want to reset your board with a clean install (or install Debian on a BeagleBone that originally came with Ångström), sometimes your best bet is to download a new image. On the original BeagleBone, you’ll be writing a bit-for-bit copy of an .img file to a MicroSD card that you boot off of when it’s inserted into the board. You can do the same on the BeagleBone Black, but you also have the option of writing the disk image to the on-board flash memory, or eMMC, so that you can later boot without a MicroSD card inserted.
On OS X
Go to the BeagleBoard latest-images page and download the most recent Debian image, which will be an .xz file. ...
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