Emmc Cid Decoder Jun 2026
For dead or desoldered chips, hardware tools like the EasyJTAG, Medusa Pro, UFI Box, or RT809H read the CID directly over the physical eMMC bus lines (CMD, CLK, DAT0). The software suites bundled with these programmers usually feature a built-in CID decoding tab.
This chip is a 4GB eMMC manufactured in February 2011. If your device expects a 32GB eMMC, you now know it has been swapped. Additionally, an old manufacturing date suggests the chip may have worn-out NAND cells, explaining boot failures.
| Bits | Field | Name | Description | | :--- | :--- | :--- | :--- | | [127:120] | MID | Manufacturer ID | 8-bit ID assigned by JEDEC (e.g., 0xFE = Samsung, 0x15 = Kingston) | | [119:112] | CBX | Card/BGA (OEM/Application) | Used by the manufacturer | | [111:104] | OID | OEM/Application ID | Identifies the OEM who built the card | | [103:96] | PNM (First 8 bits) | Product Name (Part 1) | First 8 bits of the product name (ASCII) | | [95:88] | PNM (Second 8 bits) | Product Name (Part 2) | | | [87:80] | PNM (Third 8 bits) | Product Name (Part 3) | | | [79:72] | PNM (Fourth 8 bits) | Product Name (Part 4) | | | [71:64] | PNM (Fifth 8 bits) | Product Name (Part 5) | | | [63:56] | PNM (Sixth 8 bits) | Product Name (Part 6) | | | [55:48] | PRV | Product Revision | Major/Minor revision (e.g., 0.1, 3.2) | | [47:40] | PSN (First 8 bits) | Product Serial Number (Part 1) | 32-bit unique serial number | | [39:32] | PSN (Second 8 bits) | Product Serial Number (Part 2) | | | [31:24] | PSN (Third 8 bits) | Product Serial Number (Part 3) | | | [23:16] | PSN (Fourth 8 bits) | Product Serial Number (Part 4) | | | [15:12] | MDT | Manufacturing Date | Year/Month of production | | [11:8] | (Reserved) | Reserved | Set to zero | | [7:1] | CRC | CRC7 | 7-bit checksum of CID fields | | [0] | (Reserved) | Always 1 | Fixed value |
The Ultimate Guide to eMMC CID Decoder: Decoding Your Device's DNA emmc cid decoder
Given CID hex: 1b534d3030303030302c7a2a9a8001f3 (example 16-byte hex)
The last 7 bits of the CID (bits 7:1) contain a checksum. Advanced decoders verify this CRC. If the CRC is invalid, the CID may have been corrupted due to a bad read or failing chip.
There are several free online tools where you simply paste the string and hit "Decode." For dead or desoldered chips, hardware tools like
Many car manufacturers (like VW, Mazda, or Mercedes) tie their GPS maps to the CID of the SD card or eMMC. To update maps or create backups, enthusiasts use a decoder to ensure the CID matches the vehicle's security whitelist. 3. Digital Forensics
The 128 bits of the CID register are divided into specific fields defined by the JEDEC eMMC standard. A typical breakdown includes:
On a rooted Android device or a Linux system, you can usually find the CID by navigating to the sysfs interface. Use the following command in a terminal: cat /sys/block/mmcblk0/device/cid Step 2: Decode the Hex If your device expects a 32GB eMMC, you
Counterfeit USB drives, SD cards, and devices with embedded storage frequently spoof their capacity via hacked firmware. However, reading the raw eMMC CID via hardware test points (ISP) reveals the true manufacturer and original part number, exposing fake components. 3. Digital Forensics
For bricked or locked devices, specialized tools like Riff Box, Z3X, or Octoplus can read the CID via JTAG or ISP directly from the eMMC chip.
Here is a comprehensive guide to understanding, reading, and parsing eMMC CID strings. What is an eMMC CID Register?
A 6-character ASCII string (48 bits). This is often the most readable part of the CID, showing names like "MAG2GA" or "KLMAG4."
The 128 bits of the CID register are divided into specific fields, each representing a different piece of identity data. When you read an eMMC chip using a hardware programmer (like an EasyJTAG, Medusa Pro, or UFI Box) or via software in a rooted Linux/Android environment, the CID is displayed as a 32-character hexadecimal string. Structure of an eMMC CID String