ADE7953 all registers have 0xFFFF


I have an ADE7953 evaluation board (rev C), and i have an issue reading the registers, I can connect to the chip with the software since the comm Port is found and it seems that I can reset (I see led D5 blink but not D6 and D4) but when I access the registers they're all with a value of FFFF except for CRC with 0. It all worked well a few hours ago and since I've came back I can't read anything, do you have any idea of why I have this problem ?

Thank you in advance,

Gauthier Dewulf