Does your computer recognize the SD card? It's possible you got an SD card that isn't compatible with the phone, or you got one that is just straight up faulty and doesn't work. It's happened to me a few times, it's not really that uncommon.
Does your computer recognize the SD card? It's possible you got an SD card that isn't compatible with the phone, or you got one that is just straight up faulty and doesn't work. It's happened to me a few times, it's not really that uncommon.