While "free" downloads from official sources are rare for map data, you can check for firmware updates: Official Support DENSO TEN (formerly Fujitsu Ten) website
Finding a free download for Eclipse AVN110MRC SD card software Eclipse Avn110mrc Sd Card Software Free Download BEST
Since official support for older Japanese units is limited, many users turn to specialized services: AVN726E/AVN76D Map Updates step2 - Eclipse Web While "free" downloads from official sources are rare
is difficult because the software is typically proprietary and tied to specific hardware. The AVN110MRC is a Japanese model, and when the original SD card is lost or corrupted, the head unit often becomes unusable, showing a "Program loading required" or "Insert SD card" error. Eclipse TD Official and Authorized Methods the head unit often becomes unusable