Memory card - what to do?

Hi all,

I bought an R36S just to use on a long flight coming up. Turns out it’s a clone and doesn’t even have the .dtb file or a boot partition. I’m not too fussed as it’s just for a flight but I know I need to transfer the memory card. When copying the one it came with it fails a few thousand files at the end. (I think .oog). I can’t even back the thing up to put a decent memory card in. Is there a way I can do a fresh install? Thanks a lot.