How to build Colibri iMX7 2.7 Stable Release

when I refer to the OpenEmbedded (core) article to build imx7 image, I got 2.7b5 not 2.7 stable. could you help me?

I don’t think that warning has anything to do with your issue at hand. You would need to post some more of your build log files in order for us to assess what might have gone wrong.