maurer imei can be changed,
AT+EGMR=1,7,"123451234512345"
that's the command, you need a utility app though, for exmaple in android you could use xposed installer to do it for you,
in openWRT you need an apk to communicate with the modem and re-write imei information back to it. i just don't know which utility would work, i tried UQMi but it doesn't work with the EGMR command.
another app is minicom in openWRT. that too doesn't seem to like EGMR command.
EVEN though the luci app do have imei change configuration, i don't know why it won't work' here is a screenshot.
