I don't think you can change the language of what it ships in until you register the unit and able to contact support by phone or email to get authorization for the language change. After that they may tell you that you have to delete all the car makes in the present language and download everything again in your language. I doubt if the DPF regen function was missing in software of one language, that you will have it in another language , unless there is a newer update that ads the function back, but support has been largely absent on the user forum, and I haven't read much about Autel restoring missing and broken functions in newer updates for older cars as a result of data logs being sent in.