Quectel Ec25 Change Imei [2025]

You're looking for information on how to change the IMEI (International Mobile Equipment Identity) of a Quectel EC25 module. The Quectel EC25 is a popular LTE module used in various IoT and M2M applications. Changing the IMEI of such a module can be necessary for certain applications, especially when multiple devices need to share a single cellular subscription or for testing purposes. However, it's crucial to note that modifying the IMEI can be against the law in some jurisdictions and can also violate the terms of service with your mobile network provider. Always ensure you have the legal right and proper authorization to make such changes.

2. Legal and Ethical Boundaries

Before technical details, it is crucial to note:

• Legal IMEI changes are rare and typically performed by manufacturers or authorized service centers to repair a corrupted IMEI (e.g., after a firmware crash that erases the original).
• Illegal changes include cloning a valid IMEI from another device, altering an IMEI to bypass a network blacklist, or obscuring a device’s identity for malicious purposes. Penalties can include fines and imprisonment.

Step 1: Connect to the EC25 via AT Commands

The EC25 uses a standard Hayes command set over its serial ports. quectel ec25 change imei

2. The Tools of the Trade

Unlike consumer Android phones where ADB is the primary interface, EC25 modules are usually accessed via:

1. USB Interface: The module exposes virtual serial ports (USB TTY) to the host device.
2. AT Command Port: Typically /dev/ttyUSB2 (can vary based on driver configuration option driver in Linux).
3. DM/Diag Port: Used for low-level Qualcomm diagnostics (Qualcomm QPST tools).

There are two primary methods to write an IMEI: You're looking for information on how to change

• Method A: AT Commands (Native Quectel Method)
• Method B: QPST/EFS Explorer (Qualcomm Low-Level Method)

5. Legal & Operational Risks (Real-world Cases)

• Carrier Blacklist: If the IMEI you write is already blacklisted (even accidentally), the EC25 will never register.
• Quectel Warranty Void: Any IMEI modification permanently voids your warranty. Quectel’s diagnostic tools can detect a mismatch between the OTP and NV IMEI.
• Legal Consequences: In the EU under Directive 2014/53/EU, altering a radio equipment identifier is an offense. In the US, the FCC has fined individuals for modifying IMEIs (e.g., 2018 case against a California reseller).

Step 2: Disable Radio Activity (Recommended)

Changing IMEI while the module is registered on a network is risky. Turn off RF:

AT+CFUN=0

Response: OK

Error: +CME ERROR: 100

Meaning: Unknown command. Your firmware doesn’t support AT+EGMR. Try AT+EGMR=1,7,"IMEI" without spaces, or upgrade firmware.

Missing USB Ports

If you are on a Linux host (OpenWrt/Raspberry Pi) and only see ttyUSB0: Legal IMEI changes are rare and typically performed

• The kernel module option or qmi_wwan may not be binding correctly.
• Check dmesg. You may need to manually add the PID/VID of the module to the driver.

Standard Syntax:

AT+EGMR=1,7,"NEW_IMEI_15_DIGITS"

Explanation:

• 1 = Write operation.
• 7 = IMEI identifier (most EC25 firmwares).
• "NEW_IMEI" = Your 15-digit number.