Review on 🔌 Micro SD to Micro SD (TF to TF) Card Extender Cable - Electop TF Card Reader Adapter, Flexible Extension for GPS, 3D Printer, Raspberry Pi, TV, DVD, SDXC, SanDisk, MicroSDHC (TF to TF) by Ham Channell

I've used them with an STM32 based BlueSCSI card and they don't work. BlueSCSI will blink five times indicating the card needs to be reformatted. When I plugged the adapter into a full size micro SD card and then into my computer, I tried overwriting the format using "SD Card Formatter". It pretends to format itself for a few minutes and then fails at 99%. Removing the SD card from this adapter and plugging it directly into the computer works great. Do not purchase if you do not wish to return Revain items.