You can try to find an original Japanese SD card (often found on secondary markets like eBay or specialized Japanese car audio shops). Digital Files:
Are you currently facing a specific on the screen, or are you just looking to update your navigation maps ? NSDD-W61 MAP SD CARD - CARSOLUTIONLK 2020
: Depending on the manufacturer, there might be a specific tool provided for updating. If not, you might need to manually copy the update files to the SD card.