My 650S-2CH stopped making any sound a while ago. I tried updating the firmware using FOTA, but that kept failing at about 75% - the 650 would just reboot, but on the old firmware.
I could see recordings over WiFi, btw, so it seems the card is okay.
So I popped the micro SD card out, popped it into the Blackvue-supplied reader, and popped that into my iMac. Nada. Zilch. Nothing mounts.
Any ideas most welcome.