PWM pins on board

Good afternoon, I need to connect 4 servos to the board. Where can I see the pins of the GPIO board, how many pins are there with the PWM function? The softserve example from the wiringOP library, modified for mangope h616, works poorly - frequent twitching of servos, probably due to unstable generation frequency

Let’s look at my fix of OPi.GPIO package. H616-mangopi
part features: PWM
It was tested at OrangePi Zero2 but there is same Allwiner H616 chip, but it could work also for mCore-H616