Flash last fitmware from this post
/g/nanovna-users/message/13787In it i fix some problems
Time command syntac is:
time y 2020
time m 5
time d 24
time h 13
time min 30
time sec 10
"SD_Send Cmd err CMD0, 0xFF , 0x00000000" twice and "CardType 0"
Card not detected or answer, try update firmware