The broad steps are:
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Download a Debian image to a micro-SD and boot from it;
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Write zeros over the internal eMMC to force the BBB to boot from a micro-SD without using the Boot button;
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Download the NAA BBB image to a micro-SD and boot from it.
You can stop here and have a fully functional BBB NAA that boots from a micro-SD card. Or, if you prefer you can:
- Boot from the Debian micro-SD;
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Update Debian and install unzip;
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Download the BBB NAA image, unzip it and write it to the eMMC.
Those additional steps will get you to a BBB NAA that boots from the internal eMMC.
I’ve set out details for each step in the above posts. The freeware Windows software tools I used are Win32DiskImager and PuTTY.
That’s as turnkey as the BBB NAA is going to get unless someone starts selling a pre-burnt unit.
The CuBox-i NAA is a simpler process, just download and boot the NAA image. That can be done without using a Linux terminal at all.
The Sonore SonicOrbiter SE has a pre-built NAA and is RoonReady in a CuBox-i box. It doesn’t require any downloading or writing to micro-SD cards.