Hi,we can't exhaust all the brands,but from our test,Lexar and Netac already have this problem,and we are not sure if there are other brands also have this problem.Yeah it slows down slot 1 because of an issue with one brand of cards Lexar. So because one brand has issues we all suffer slower speeds of slot 1 if we use other cards that aren't an issue.
https://www.head-fi.org/threads/fii...involving-micro-sd-slot-1-on-fiio-m11.904457/
And we also have tried to slow down slot 1 only when you use those two brands,but we found that the maif_id of Samsung and other brands may the same with Lexar and Netac,it means that we can't tell which brands are normal.
So to ensure absolute safety,we have adopted the current way,and it won't have any impact on your daily use.
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