My 2 cents. I had same problem. SD card unable to mount thingy. I read the this thread and I found Twin issues.
1. My SD card adapter was LOOSE at resting place.
2. My another SD card was NOT formatted as FAT32 but ex-FAT.
so to test if my SD card slot is not failing. I went to vWII mode and try...
I see something similar on Alibaba. Ca't find in USA anywhere though.
usb to sd card with usb interface / port / slot adapter extender cable
https://wholesaler.alibaba.com/product-detail/usb-to-sd-card-with-usb_60557844264.html
