Quectel Ec25 Change Imei -

If you have read this far searching for "quectel ec25 change imei", here is the executive summary:

For 99% of users, the factory IMEI is perfectly fine. The remaining 1% who legitimately need to change it now have a reliable, documented procedure.

AT+QCFG="imei",0,"123456789012345"

ls /dev/ttyUSB*   # Typically ttyUSB2 is the AT port
sudo screen /dev/ttyUSB2 115200

Once connected, type:

AT

The module should reply:

OK

If not, check power, wiring, and drivers.

AT+CGSN # Verify

This involves low-level access via Qualcomm’s Diagnostic Port (9008/9091 mode).

Steps (high-level):

Outcome: Works on most EC25 revisions. The change persists across power cycles and firmware updates.

Risks: One wrong byte can brick the module. QFIL is unforgiving – no “undo”. Requires vendor-specific firehose programmers (.mbn files), which are not publicly available for EC25 without an NDA with Quectel. quectel ec25 change imei