Samsung M017f Isp | Pinout 2021

DAT0 (Data Line 0): The primary data line. This is the most critical connection; without it, no data transfer occurs.
CMD (Command): The line used to send command packets to the eMMC controller.
CLK (Clock): Provides the timing signal for data synchronization.
VCC (Power): Power supply for the eMMC core (usually requires 2.8V).
GND (Ground): The common ground reference.

Keep your wires as short as possible (under 10cm) to prevent data noise and connection failures.