I agree about the preference of Yamaha over Korg, but maybe this person likes his Korg and is wanting to simply play a flash drive through it as an accompaniment.Advice is simple, send it back for a full refund.
The 600 was released in 2016, it is in reality an old model and is not worth spending time learning the OS.
Even the 700 and 1000 models have been sold since 2017 so they to are old and none of these Pa models have received any significant upgrade to their OS since their release.
I used to be a Korg fan, but not any more, they are currently still trying to regroup their Management resources and even their flagship 5X has been out for a year and there have only been minor bug fixes to a very flawed product.
Buy a Yamaha with your cash.
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