Hi Tony,
As I only have access to two SD micro cards which both work with my changes. I can’t really tell why it doesn’t work for you.
As I understand from your post is that you get the File NoPlace errors for both BMP and DAT files?
Maybe a silly question but did the software download work? You can see this immediately when starting the DSO nano because the purple demo wave is not displayed anymore.
I found another small bug in loading already saved DAT files. The index counter FILE001.DAT FILE002.DAT (001 and 002) does not work so you will always see FILE001.DAT.
Although this has nothing do with your problem, maybe others who tried the fix discovered this aswell. I’m working on that now.
I may help if other people who downloaded the changes would tell about their experiences.