EMMC CID Patcher Tool

EMMC CID Patcher Tool Process

EMMC CID Patcher is a Windows base tool by Knotthailand that is used for calculating the CRC-7 eMMc JEDEC.



  1. CID Original:

    • Copy the original CID from the eMMC chip using your ISP (In-System Programming) tool (e.g., ISPT001).
  2. New SN (Serial Number):

    • Enter a new serial number (SN) with a numeric value (0-9) as recommended.
  3. Change SN CID - CRC7 Calculator:

    • Use the tool to calculate the CRC-7 value based on the new CID you are creating. This is crucial as the CRC-7 ensures data integrity and proper functionality.
  4. Copy New CID:

    • Once the new CID is generated, copy it to your UFI Box.
  5. Patch CID:

    • Use the Easy JTAG Plus software to patch the CID directly to the eMMC firmware. This usually involves:
      • Writing the new CID to the eMMC.
      • Ensuring that the firmware is compatible with the new CID.
  6. Medusa eMMC Firmware:

    • Like the Easy JTAG process, use the Medusa software to patch the CID.
    • Make sure you create the new CID from another box first, as indicated.
  7. Write Medusa PRO:

    • Finally, write the new CID using the Medusa PRO tool.

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