You can try the flyme phone finder app. The phone must be linked to flyme account, with internet connection and GPS enabled (also it needs to be on. Shouldn’t be as you should have tried calling it). This is not very reliable way to find a phone, don’t think there is another method.
@siama You can try to use find my phone by google using the same google account in the m2 with some luck you will be able to locate it.
Or try with finder.flyme.cn using your flyme account. (you will have to translate some part to understand the interface)
Hope it will help.