My Lumia 625 does not detect MicroSD cards when inserted.
I have tried powering off/on.
I have tried formating them in my PC.
I have updated my phone to 3050.0000.1334.0007
I have tried a Kingston 64GB SDXC Class10
I have tried a Sandisk Ultra 64GB SDXC Class10
I have tried formatting the cards in various ways including exFAT / FAT32 / FAT64 etc.
The only progress i made was when i tried formatting in NTSC and after inserting the card i recieved a message saying "incomattable formatted card inserted, do you whish to format the card in a compattable format?" After choosing yes, the phone formatted the card and then the card was undetected...
This was confirmed by checking the card in my PC, which confirmed that the card had been formatted using exFAT, which i believe is the correct format for the phone/card.
Clearly the phone is somehow detecting and writing to the card and the card is functioning properly, except that the phone does not detect that the card exists as expanded memory and will not allow me to use it.
Any help with this would be really appreciated!
Becoming quite frustrated now...
Have you tried to perform a reset? It will delete all your data so backup is required. See this link: http://www.windowsphone.com/en-us/how-to/wp8/basic
If the reset will not work, it is best to have your phone checked by our care point. Visit www.nokia.com/support for more info about the repair process.