Quectel requires a special password to modify IMEI:
Quectel modules use a specific set of AT commands to write to the NVRAM. There are two primary methods depending on the firmware version and security level. Method A: The Standard Command quectel ec25 change imei
Undeterred, Alex decided to take on the challenge. He downloaded the Quectel EC25's firmware and began to dig through the code, searching for any references to the IMEI. After hours of tedious searching, he finally found a section of code that seemed to be responsible for storing and retrieving the IMEI. Quectel requires a special password to modify IMEI:
I tested two EC25A modules (original IMEI vs changed IMEI) on T-Mobile US and Verizon. He downloaded the Quectel EC25's firmware and began
The primary hurdle in changing an IMEI is not technical, but legal. In many jurisdictions, including the United States, United Kingdom, and many EU member states, tampering with a device’s unique identifier is a criminal offense.