3G 4G LTE EC25 IMEI spoofing / change for mobile.free.fr network compatibility

Hi, i’ve turris omnia with EC25 LTE card from QUECTEL and it works fine.

I’ve change my sim card for a mobile.free.fr one to have more data, but… mobile.free.fr have a specificity :
if your mobile is only compatible with 3G your data is limited to 3Go/month for any subscribed plan.
if your mobile is 4G compatible, you have 50Go/month on my plan, 100Go/month or illimited in the bigest plan.

How mobile.free.fr detect if your mobile is 4G compatible ? Not by usage, but by IMEI whitelist.
Constructor send to mobile.free.fr there 4G compatible IMEI range, and if mobile.free.fr is on the mood, your smartphone will be able tu use more than 3Go/month data.

I can ask QUECTEL to send there IMEI range to mobile.free.fr, but because it’s internal card and not smartphone, i doubt mobile.free.fr will add it to there whitelist.

So my question is : is there a way to spoof the EC25 IMEI with somme OpenWrt config to look like a modern smartphone one the eyes of mobile.free.fr ?

The best i’ve found about this is :
http://www.imei.info to know what device is detected with my imei
http://forums.whirlpool.net.au/archive/2638357 for some talk about IMEI change
https://www.quora.com/How-do-I-change-IMEI-in-Android-without-using-Xposed-framework idem for android
and uqmi -d /dev/cdc-wdm0 --get-imei to disply my imei

any help ?

Was just wondering about this myself here in Canada/US as many data only plans require the IMEI.