then it means the image you download will change the APN automatically, but the offical WP77 image will not, is that what you mean?
Have you tried download the official WP77 image to it to confirm?
Have you tried to download the octave image to mangoh Red board with WP77 and see if it will change the APN?
is that only the yellow_wp77xx_0.6.0-octave.spk image will make the problem but no problem is found for mangOH-2.1.4.wp77xx.spk (mangOH Red image)?