| Problem | Possible Cause | Solution | |--------|----------------|----------| | AT+EGMR returns ERROR | Module is modern (EC25/EG95) or command locked | Must use QPST or Quectel license | | New IMEI not saved after reboot | NV write not committed | After QXDM write, send AT+CFUN=1,1 or power cycle | | Module connects to network but no data | IMEI checksum mismatch (Luhn algorithm) | Ensure last digit is correct checksum of first 14 digits | | Carrier still rejects module | Carrier has IMEI + TAC (Type Allocation Code) whitelist | Change first 8 digits (TAC) to a whitelisted range (illegal without permission) |

An IMEI is a 15-digit unique identifier assigned to every cellular device. It is the hardware’s fingerprint to the mobile network.

For consumer phones, IMEI changes are almost always illegal. For industrial Quectel modules, there are grey areas and legitimate use cases:

On many Quectel modules (EC25, EG95, etc.), the command syntax is:

AT+EGMR=1,7,"IMEI_NEW"

Where:

Prerequisites:

| Use Case | Legality | Reason | |--------------|--------------|-------------| | Factory programming | Legal | Manufacturer sets original IMEI. | | Authorized repair centers (replacing damaged module) | Legal with carrier approval | Maintains original IMEI of the device. | | R&D and internal testing (non-commercial networks) | Often allowed | Isolated lab environment. | | Cloning another device’s IMEI | Illegal (felony in many countries) | Enables fraud, theft, or evading bans. | | Changing IMEI to bypass a network block | Illegal | Violates terms of service and criminal laws. |

While the technical capability to modify the IMEI on Quectel modules exists—facilitated by diagnostic interfaces, QMI protocols, and proprietary AT commands—it remains a highly restricted procedure. Legitimate applications are confined strictly to OEM manufacturing lines and authorized repair centers.

The unauthorized alteration of IMEI numbers undermines the integrity of mobile networks, facilitates the use of stolen hardware, and violates criminal statutes in most jurisdictions. Therefore, research into these mechanisms should be strictly limited to defensive security analysis and the development of anti-tampering technologies.

Disclaimer: This paper is for educational and informational purposes only. The author does not condone or encourage the illegal alteration of IMEI numbers. Tampering with device identifiers is a criminal offense in many jurisdictions.

Changing or repairing the International Mobile Equipment Identity (IMEI) on Quectel modules like the EG25-G or EC25 is a specialized task typically reserved for authorized repair or development scenarios. While technically possible via specific AT commands, the process is heavily restricted by firmware and local laws. Technical Overview of the Quectel IMEI Process

For many Quectel modules, the IMEI is stored in a protected non-volatile memory area. Standard documentation Quectel AT Commands Manual often only lists commands for viewing the IMEI. 1. Checking the Current IMEI

To identify your module's current IMEI, you can use the standard AT+CGSN or AT+GSN commands. Command: AT+CGSN Response: 860195057712345 2. The Repair Command (AT+EGMR)

The command most frequently cited for IMEI modification is AT+EGMR. This command is often undocumented in official public manuals and may require specific firmware versions to function. IMEI modification on EG25G - Quectel Forums

The primary method for changing or repairing an IMEI on Quectel modules is through the undocumented AT+EGMR command. While Quectel generally prohibits IMEI modification for end users and does not document this command in official manuals, it is commonly used for "repairing" modules that have lost their identity due to firmware corruption or to comply with local regulations requiring specific IMEI formats. AT Command Method

This method works on popular modules like the EG25-G, EC25, and EP06. Change IMEI Number on Android Devices | PDF - Scribd

For Dual Sim Phones * Rooted Android phone or tablet. * Install Android terminal emulator app. * Open android terminal emulator. * EC25EU LTE not working after update - Quectel Forums

Changing IMEI on Quectel Modules: A Comprehensive Guide

Introduction

Quectel is a leading provider of wireless communication modules and solutions. Their modules are widely used in various industries such as IoT, industrial automation, and smart cities. One common requirement when working with Quectel modules is changing the IMEI (International Mobile Equipment Identity) number. In this blog post, we will cover the basics of IMEI, why you might need to change it, and provide a step-by-step guide on how to change the IMEI on Quectel modules.

What is IMEI?

IMEI is a unique 15-digit serial number assigned to every mobile device, including cell phones, smartphones, and mobile modules. It is used to identify a device on a cellular network and is usually stored in the device's firmware.

Why Change IMEI on Quectel Modules?

There are several reasons why you might need to change the IMEI on a Quectel module:

How to Change IMEI on Quectel Modules

Changing the IMEI on Quectel modules involves modifying the module's firmware. The process may vary depending on the specific module model and firmware version you are using. Here is a general step-by-step guide:

Method 1: Using AT Commands

Quectel modules support AT commands, which allow you to control and configure the module. You can use the following AT commands to change the IMEI:

Example:

AT+CGMI
357852104123456
AT+CGMI=357852104987654

Method 2: Using Quectel's QFlash Tool

QFlash is a software tool provided by Quectel for flashing and configuring their modules. You can use QFlash to change the IMEI number:

Method 3: Using Firmware Modification Tools

Some Quectel modules have specific firmware modification tools, such as the Quectel L35 and L76 series. These tools allow you to modify the firmware, including the IMEI number.

Conclusion

Changing the IMEI on Quectel modules is a relatively straightforward process, but it requires careful attention to the specific module model and firmware version you are using. Before attempting to change the IMEI, make sure you have a good understanding of the process and the potential risks involved. If you are unsure, consult the Quectel documentation or contact their technical support team for assistance.

Additional Resources

Disclaimer

The information provided in this blog post is for general purposes only and may not be applicable to your specific use case. Quectel and its affiliates disclaim any liability for any errors or damages resulting from the use of the information provided.

The ability to modify an International Mobile Equipment Identity (IMEI) on Quectel modules like the EG25-G, EC25, or EP06 is a common point of discussion for developers and advanced users. While technically possible via specific AT commands, it is a sensitive procedure with significant legal and operational implications. Technical Implementation: The AT+EGMR Command

The primary method for IMEI modification on many Quectel modules is the AT+EGMR command. This command allows you to read or write specific device identification strings.

Read Current IMEI: To verify your current identifier, use the read parameter:AT+EGMR=0,7

Write New IMEI: To update the identifier, the write parameter follows this syntax (replace the placeholder with a 15-digit number):AT+EGMR=1,7,"123456789012345"

Verification: After sending the write command, you can confirm the change by dialing *#06# on a connected handset or by re-running the read command. Critical Risks and Legal Considerations

Before proceeding, it is vital to understand the risks involved in "repairing" or changing an IMEI: IMEI modification on EG25G - Quectel Forums

In the world of IoT (Internet of Things), Quectel is a giant. Their modules—ranging from the legacy GSM/GPRS M95 to the cutting-edge 5G RM520N—power millions of devices worldwide, from electric vehicle chargers and industrial routers to asset trackers and smart meters.

However, developers and system integrators frequently search for a specific, sensitive command: "Quectel change IMEI."

If you have landed on this page, you likely need to modify the International Mobile Equipment Identity (IMEI) number of your Quectel module. This article covers everything you need to know: the legal landscape, why you might need to do this, the exact AT commands for various chipsets (Qualcomm, ASR, RDA), and the risks involved.

Disclaimer: This article is for educational purposes and authorized device management only. Changing an IMEI to bypass legal tracking, evade theft blacklists, or commit fraud is illegal in nearly all jurisdictions (USA, EU, UK, China). You must own the hardware and have a legitimate operational reason (e.g., network whitelisting) to change the IMEI.

AT+EGMR=1,7,"YOUR_15_DIGIT_IMEI"