If you just want to wirelessly obtain books from your calibre library, you can use calibre's "Content server" and KOReader's OPDS support, that still works, as always.
Luck;
Ken
P.S.; I am assuming that you have tried a number of different USB cables.
PPS; You should be able to find Max/Apple versions of the tools to upgrade the memory microSD, they should let you see and expand the FAT32 partition. ( I use BootIce to rearrange the partitions in the partition table so Windows can mount the uSD card. )
Last edited by Ken Maltby; 10-15-2017 at 08:57 PM.
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