Here&#x27;s an old project I found for the v800 but that has worked great for my m400. 
<a href="https:&#x2F;&#x2F;github.com&#x2F;profanum429&#x2F;v800_downloader" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;profanum429&#x2F;v800_downloader</a><p>It will download recordings via usb and convert them to tcx automatically :)<p>It&#x27;s saved the day numerous times for me when polar&#x27;s sync app was acting buggy - saying it uploaded a run but not completely uploading it.<p>They don&#x27;t give you binary&#x27;s but I was able to compile it fine on my mac.