Microsoft Lumia 1520 Could not Format the Memory Card what to do?

Restart the phone and try again, or if you have the adapter and a card reader for your PC, plug it into the PC and format it that way.
 
i bought this one 64 gb sandisk card previous month.

Any pics of the memory card and the pics of failure to format it? I bought two 32 GB Sandisk Ultra Class10 microSD cards for my Lumia 1520 and Xiaomi Note, formatted them in-phone and I have no problems with them, maybe you bought a defective memory card or a cheap, bogus fake pretending to be a genuine Sandisk card.
 
Yep, you might have bought a defective memory card or a cheap, bogus fake.

If you have bought a genuine but defective memory card then you can have it exchanged at a Sandisk facility or a local agent but if you bought a cheap, bogus fake, then the only thing you can do is buy a new memory card.

Posted via the Windows Central App for Android
 
its in 5 years warranty & i have claim. i have send it to center for claim & its origional and its new...