Waveshare 4.2 3C not displaying

[BTMC1]

Hello ,

First thanks for your program ,

I'm encountering a problem with a new waveshare 4.2 3C I bought .

I switched the line corresponding to the new model GxEPD2_3C<GxEPD2_420c, GxEPD2_420c::HEIGHT> display(GxEPD2_420c(/CS=D8/ EPD_CS, /DC=D3/ EPD_DC, /RST=D4/ EPD_RST, /BUSY=D2/ EPD_BUSY));

Here are my pins for my firebeetle V4.0 : static const uint8_t EPD_BUSY = 27; // to EPD BUSY static const uint8_t EPD_CS = 9; // to EPD CS static const uint8_t EPD_RST = 16; // to EPD RST static const uint8_t EPD_DC = 17; // to EPD DC static const uint8_t EPD_SCK = 18; // to EPD CLK static const uint8_t EPD_MISO = 19; // Master-In Slave-Out not used, as no data from display static const uint8_t EPD_MOSI = 23; // to EPD DIN

The program is running well and i'm able to have all data on series monitor , but nothing is displaying on the screen , I don't know where to look , here is the end of the message each reset :

_PowerOn : 5 _Update_Full : 1 _PowerOff : 1 _PowerOff : 1

Triple checked cables and pins . Let me know if you have a solution to my problem . Thanks & have a great day !

[G6EJD]

static const uint8_t EPD_CS = 9; // to EPD CS

Pin-9 is already in-use for the on-board SPI flash SD2, choose another spare pin and update your pin definitions to match

[BTMC1]

Wow , problem solved , thanks a lot !!! You saved me a lot of time :)