Tried it yesterday. I have a 64gb and a 32gb both was working fine
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But it still can detect sd card. Before that it couldn't even detect
so with the 64GB and 32GB SD cards WHICH YOU FORMATTED IN THE SWITCH and are working fine.. downloada fresh copy of the SX OS 2.7.1 and unpack it on both SD cards. Then try to use your RCM and usb dongle to boot into SX OS with them.