I recently ordered and received the Ultimate SD Cartridge for Colecovision. It was working fine and I was able to add several ROMS all working fine. It seems to have stopped working – on power up it displays only a black screen with >> Reading Data From Card <<
If I push the Reset switch on cartridge it comes back with

> Checking For System Software <

Pushing key gives same result.

Is there something I can do to remedy?

Went through upgrade process and all is well!