Hi - I am having the same issue with my UZEBOX Starter Kits. I have just built 2 of these kits and they are both doing the same thing. The tetris works fine but as soon as I go to the bootloader, it is like it isn't recognizing the SD card that came with the kit. It knows a card is present but doesn't give me any directory / game listing. If I remove the card, it knows no card is there. Then I replace the card and it gives me a blank loading screen like the attached picture. I have tried different cards ( I had ordered 3 kits, thinking I would build them with my daughter's grade 7 class )
It looks like either the bootloader isn't working properly ( is the ATMEGA being shipped with the correct FW load? ) or the SD card is not recognized by the system. ( Did you change SD card suppliers recently? Mine came with Elite Pro HS 256MB SD Memory Cards ). Or is it something that I am doing incorrectly? The schematics that I see online don't seem to be a correct representation of this version of the board. ( V1.3.1 ) when I download them from the http://belogic.com/uzebox/downloads.htm
PS - I can see the games are present on the SD card when I insert it into my laptop SD card slot.
Can you please verify that the SD cards and bootloader combination that shipped to me is compatible and works together and what my next steps should be?
PS - My system is a Win 10 - 64 bit unfortunately for recompiling anything as it appears that any tutorials discussions only refer to older compilers.
Thanks very much for your assistance.