How to find the real manufacturer of my device?
One tool that came to mind, is CPU-Z.


  Description
  
  Android version of the popular CPU identification tool for PC, CPU-Z
  is a free application that reports information about your device.
  
  
  SoC (System On Chip) name, architecture, clock speed for each core ;
  System information : device brand &amp; model, screen resolution, RAM, storage.;
  Battery information : level, status, temperature, capacity ;
  Sensors.
  


Permissions :


INTERNET permission is required for the online validation
ACCESS_NETWORK_STATE for statistics.