I need a DMP for MPU6886

You can use M5Stack's MPU6886 Library with Mahony/Madgwick Filter
M5Stack provides an official MPU6886 library:

Then you can feed that into a sensor fusion algorithm such as:

Madgwick Filter:

  • Lightweight and fast
  • Good for microcontrollers

GitHub: Madgwick AHRS or Arduino-compatible fork