Download beta versions of Apple's iOS, iPadOS,
macOS and tvOS firmware.
Identifies the original equipment manufacturer or application token. [103:56] (Product Name)
The breakdown of these fields is as follows:
The decoder translates 6 bytes of hex data directly into ASCII characters. For example, a hex sequence of 4A 53 47 34 41 4D decodes to JSG4AM , which is a specific Samsung eMMC model name. This helps technicians find exact replacements or compatible replacement parts. 3. Manufacturing Date (MDT)
crc_status = "VALID" if calc_crc == read_crc else "INVALID"
The CID register is a mandatory component of the eMMC specification defined by JEDEC (the Joint Electron Device Engineering Council). It is populated by the manufacturer during the factory programming phase and becomes read-only once the chip leaves the factory. emmc cid decoder
If you are working with an Android device via ADB shell, an embedded Linux board, or a Raspberry Pi, run the following command: cat /sys/block/mmcblk0/device/cid Use code with caution.
chip. It serves as a permanent digital fingerprint, containing manufacturing details crucial for device security, firmware validation, and hardware repair. Prodigy Technovations 1. CID Register Structure According to the JEDEC JESD84-B51
No. USB card readers act as USB mass storage bridges and do not expose the low-level MMC command interface required to access the CID register. You need a native MMC/SD host controller, typically found on the mainboard of computers with built-in SD card readers.
Manufacturer: Samsung (0x15) Product Name: 4GBU Revision: 0.1 Serial Number: 5903040 Date: 2018-08 This helps technicians find exact replacements or compatible
| Field | Bits | Size | Description | |-------|------|------|-------------| | | [127:120] | 8 bits | Manufacturer ID—a unique identifier assigned by JEDEC | | Reserved | [119:114] | 6 bits | Reserved for future use | | CBX | [113:112] | 2 bits | Device type (00=Removable, 01=BGA Discrete, 10=POP, 11=Reserved) | | OID | [111:104] | 8 bits | OEM/Application ID—identifies the device OEM or content | | PNM | [103:56] | 48 bits | Product name—a 6-character ASCII string | | PRV | [55:48] | 8 bits | Product revision—encoded as two BCD digits (n.m format) | | PSN | [47:16] | 32 bits | Product serial number—a unique 32-bit unsigned integer | | MDT | [15:8] | 8 bits | Manufacturing date—encoded as month (high nibble) and year (low nibble) | | CRC7 | [7:1] | 7 bits | Checksum of the CID contents | | Reserved | [0:0] | 1 bit | Always 1 |
The 6-character ASCII string representing the model (e.g., "KLMAG8").
An 8-bit field split into major and minor hardware/firmware revisions.
With tools like mmc-utils and lsmmc readily available on most Linux distributions, along with online decoders and custom Python scripts, accessing this information has never been easier. Understanding how to read, decode, and interpret CID data enables better device authentication, counterfeit detection, and system verification—making it a fundamental skill in the embedded systems ecosystem. It is populated by the manufacturer during the
Converts complex hex strings into readable manufacturer names, dates, and models instantly.
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The is far more than a novelty. It transforms an obscure 128-bit identifier into actionable intelligence. Whether you are a hardware hacker trying to revive a dead router, a forensic analyst verifying data chain-of-custody, or an embedded engineer authenticating supply chain components, decoding the CID is a fundamental skill.
