Right ! Good catch ! I seems that dashes/underscores issue appeared when we switched from 4.20.y to 5.0.y and still unfixed in 5.5.y . I will try to fix that in the following days ... In the meantime, Yes, you need to fix the overlay along the fixup script ...   EDIT: During a second look, it seems that /proc/device-tree/__symbols__/ has underscores. So, maybe both are working. I will try to figure out ...   EDIT2: Here is the commit : https://github.com/armbian/b