[LAU] Problem with SD card and new Zoom H5

Hello everyone, In my testing of my new Zoom H5, I foolishly did not test the standalone recording capabilities, which require a working SD card. I tried using the included SD card. When I tried to format it, I got an error. When I tried the quick performance test, it alternately gave me NG, and just froze part of the way through. I have like one day left to return this to Amazon India. Should I do so or not. I just checked my account and it says returnable till July 7th. It's now the morning of the 6th (local time is IST = UTC+5.30). So I don't have a lot of time to think about it. Even assuming it is a corrupt SD card, should the Zoom freeze like that? And if it is not corrupt, something is clearly wrong. I don't have any other way to test the SD card. Should I buy another SD card and try it with that. As you can see, I don't have much time. Thanks in advance for any advice. Please CC me on any reply. Regards, Faheem Mitha