The module should reply:

Invalid IMEI length or checksum. Ensure digits are exactly 15 digits (0-9 only). No spaces, no letters.

This is where the interest turns into intrigue. In many jurisdictions, including the US, UK, and much of the EU, altering an IMEI is a legal minefield. Because the process can be used to "unblock" stolen phones, laws like the Wireless Telephone Protection Act make it a serious offense to knowingly tamper with these identifiers.

Try without password first. If it returns ERROR , use:

Here’s a detailed, technical review of the process, risks, and considerations involved in changing the IMEI on a Quectel EC25 series module.