can't read wan ip

hi, i am using quactel ec20 in my country. why the imei is blocked for the latest version, if i change the imei to the old version then the module can read the wan ip. what happened?

Thank you…

Hi,
What is the meaning of old version? Usually, IMEI won’t be changed whether you update the firmware or not?
If specified IMEI is blocked, please check with your operator.