In order to fulfill the basic functions of our service, the user hereby agrees to allow Xiaomi to collect, process and use personal information which shall include but not be limited to written threads, pictures, comments, replies in the Mi Community, and relevant data types listed in Xiaomi's Private Policy. By selecting "Agree", you agree to Xiaomi's Private Policy and Content Policy .
As this is a online platform, it is difficult to determine the actual owner of the device, hence, we won't be able to help you further other than guiding you to factory reset the device to restore phone functionality.
Boot to recovery mode (Volume Up + Power) and select "Wipe Data"
All data will be lost upon the commencement of such an action. Please backup before continuing.