I got errorcode = 4.Attached you can find two screenshots. SCR01 after executing  /* Card initialization */ errorstate = MMC_InitCard(hmmc);  I noticed that the clock changes from 400 KHz to 24 MHz at the end. SCR02 after executing   /* Set Block S...

Hello, thank you for your reply. I am working with David on this issue.The error comes from the below code inside the HAL_MMC_InitCard() function. Does it give you any clue? /* Card initialization */ errorstate = MMC_InitCard(hmmc); if(errorstate...