The NDDN-W57 and NDDN-W58 are DVD-based navigation systems. Unlike modern units that use internal hard drives or SD cards for the OS, these models require the map disc to "boot up" the system software.
: Insert the finalized disc into the map DVD drive (often located behind the motorized screen). The unit should automatically detect the disc and begin an update process that takes several minutes. Where to Find Software
When power is lost, the head unit resets to a "Please insert correct map disc" screen, often displaying Japanese characters. Without the boot disc (or map disc containing the boot file), the following features are typically disabled: JustAnswer Audio & Multimedia : FM/AM radio, CD/DVD playback, and auxiliary inputs. Rearview Camera
If you do not have the original disc, you can often create one by downloading the specific software for your model.
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