For EU - Gardening Mama has 9.2.0 and it should be enough to run all games.
I'm just getting problem after problem with this so far. I have EU Cooking Mama Bon Apetit, which has the same firmware. I used the DPAD UP when launching technique as previously described in another post. However, when I try to pick cooking mama from the select menu, the screen freezes and doesn't bring up anything else without a hard reset.
Currently just dragging and dropping onto the cart because on the Win32 issue I am having, I assume this is the problem?
Don't use win32diskimager to write games, just copy them as files. Microsd should be formatted to exfat or fat32.
Can you run other games, old ones like Zelda OoT?