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The terminal will display a 15-digit number. Copy and save this string safely. If anything goes wrong, you will need this original number to restore functionality. Check Firmware Version
However, one topic that surfaces repeatedly in technical forums and within the developer community is the ability—or perceived necessity—to change the module's unique 15-digit IMEI (International Mobile Equipment Identity). Whether driven by a desire to circumvent carrier restrictions, replace a corrupted IMEI after a failed firmware update, or for other advanced use cases, the process is fraught with complexity and serious legal implications.
Check that the module is powered and not in low-power mode ( AT+CFUN=1 ). Also verify that another application (like a PPP dialer) hasn’t locked the port. quectel ec25 change imei
Accessing the modem via AT commands using a serial terminal (like PuTTY or Tera Term).
Forcing the modem to use specific LTE bands ( AT+QCFG="band" ) to improve signal strength. The terminal will display a 15-digit number
A USB-to-TTL serial adapter (if not connecting directly via the module's native USB interface).
If the IMEI reverts after a power cycle, the module may have a hardware write-protect enabled or a customized firmware that pulls the IMEI from a secondary OTP (One-Time Programmable) memory. Check Firmware Version However, one topic that surfaces
Mounted on a compatible PCIe evaluation board or development kit.