There are two hardware versions available on NXP website for QN902x, which are QN902x/DY and QN902x/EY. QN902x/DY is with die version B2, while QN902x/EY is with die version B4
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How to Migrate from QN902x/D to QN902x/E
There are two hardware versions available on NXP website for QN902x, which are QN902x/DY and QN902x/EY. QN902x/DY is with die version B2, while QN902x/EY is with die version B4