How to set on power on GPIO behaviour (orange pi 3B)?

prixes

Hi,
I have orange pi 3b. I searched all over internet for information how to set on startup/power on GPIO pins behaviour, but i cannot find anything.
Most of GPIO pins are set to IN mode 1. Sadly I need them to output mode 1.
I am scared something could burn this way since i set them to though wiringPI after kernel boot sequence is complete.
Can some one give information how I can set them up at earlier point when I power on the board?
I found that DTB/DTS file could do it. But there is no clear information / pin addresses I should set.
Thanks in advance!
Regards!