Thanks, but I'm still not able to connect to my chip.
I use this schematic for the voltage conversion from 5V to 3V (where I assume that the non _L pin stands for the Arduino pins, and the pins with the _L in the end are the chip pins):
And this for SPI references(where I assume CS = SS, SCK = CLK, MISO = DO, MOSI = DI):
Then I just run the FlashDiagnostic example from the library you linked (without changing anything of the code) and it's no work at all.
What I'm doing wrong here? Thanks!