It doesn't work for me either :/ I'm just on vanilla 10.3.0-28E. Stuck on the black Nintendo 3DS screen forever.
EDIT: I tried updating the game both from the menu screen and through eShop.
Thanks for the good work yellows8!
But yeah, 10.3 New 3DS EUR with ironhax here, and eShop freezes on the front page. Everything else works just fine. I didn't have the .xml file originally but downloading it didn't help.