How to calibrate automatic focusing when BYINTEK P70 P21 Projector has unclear focus？

Описание

Step：
1. Enter 'Settings'
2. Find ' Keystone setting',
3. Then turn on "Auto focus"
4. Press the 'Menu' key 6 times
5. Find '补偿'
6. Press“ left ” or “ right ”, Press the "OK" button to check if the focus is clear?
7. Try multiple times until the adjustment is clear