: If the battery was disconnected, the system will ask for the SD card to reboot. Without it, the screen will remain blank or display an error message in Japanese.
Use a high-quality 8GB or 16GB SDHC card (Class 10 is recommended for faster boot times). Avoid large SDXC cards (32GB+), as the older file system of the radio may not recognize them. nsdd-w61 sd card
Find a verified download link for the "NSDD-W61 boot files" or "loading.kwi" firmware file online. : If the battery was disconnected, the system