Help apm 2.6 / 2.8

Good Morning,
I am new to the forum, I am from Brazil and here nobody helps anyone, I am having a huge difficulty with my apm, I bought it as apm 2.6 but I have doubt if it really is because I can not calibrate the gps, in the calibration it starts to color the white dots and Never ending always appears new point and sometimes add points only getting axis …
I opened my apm and took some photos, could anyone tell me what the model of this apm please, and if this happened in calibration with someone, thank you.