@Romain_blcd You can try to install “A” firmware, but that means only English and Chinese will be available as languages
And about the IMEI:
The International Mobile Station Equipment Identity or IMEI is a number, usually unique, to identify 3GPP and iDEN mobile phones, as well as some satellite phones.
The IMEI number is used by a GSM network to identify valid devices and therefore can be used for stopping a stolen phone from accessing that network. For example, if a mobile phone is stolen, the owner can call his or her network provider and instruct them to “blacklist” the phone using its IMEI number. This renders the phone useless on that network and sometimes other networks too, whether or not the phone’s SIM is changed.
That’s why stealing a phone nowaday is the pointless shit you could ever do