@jasko said in SD CARD PROBLEM DUET 6HC V1.01:
SD card 0 detected, interface speed: 12.5MBytes/sec
It says the card is detected, but the interface speed is slow for a 6HC; it should be 25MB/sec. This may suggest an issue with the SD card or the socket. As you have tried other SD cards, can you post a picture of the SD card socket and the components around it?
If you remove the card, does M122 then report it starting in SBC mode? If the SD socket has failed, and the board is over 2 years old (ie out of warranty), you may be able to run it in SBC mode.
Ian