While doing absolutely nothing, my phone, Huawei Nexus 6P entered a boot-loop mode (it's not going further than showing "Google" text). The only thing I can do is to enter secret menu, but when selecting "Recovery mode", nothing happens. OEM is locked, fastboot flashing unlock is not working because of this. Now I am trying to figure out what happened and I got nothing yet. Does this happened to some of you?