Hello and thank you for your reply.
Don’t get me wrong here. Nativ DSD is not a must have feature for me but would be nice to have. 
Which parts of the PCB has to be replaced? As far as I see, the pins used for a DSD-transmisson are the same as for a PCM-transmission. DATA_CLK, DATA1, DATA2 on the ES9038 for the audio signal. And maybe SDA and SCL to switch the input_mode manually to DSD (not shure about that). All of these pins are connected to the XMOS MCU, so a update of the firmware should be enough to enable nativ DSD?
What else I’m missing here?
Anyway, this is really a great board. And one of the best entry level DAC-board’s on the market.