Don't give up so easily on failure of CMD55 to put the card into app-cmd mode.  We don't know why it failed, so we can't know that a retry will also fail (the low-level driver might have reset the controller state machine or something similar that would allow a retry to work).
Don't give up so easily on failure of CMD55 to put the card into app-cmd
mode.  We don't know why it failed, so we can't know that a retry will
also fail (the low-level driver might have reset the controller state
machine or something similar that would allow a retry to work).

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