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.
Some EC25 modules ship with IMEI write-protection enabled. To disable it temporarily, you may need the "IMEI unlock password" from Quectel (usually available only to verified OEM customers). However, for most standard EC25 modules: quectel ec25 change imei
Reboot the module for the changes to take effect. One wrong byte can brick the module
Ensure the Quectel USB Serial drivers are installed on your Windows or Linux host. Terminal Software: Windows: QCOM, Putty, or Tera Term. Linux: minicom or screen . Step 1: Establish Communication quectel ec25 change imei