Hi kakarot,
Are you using the devkit or custom board for Orin NX?
Do you mean the sysfs to control GPIO? (i.e. /sys/class/gpio/export)
If so, the feature of using sysfs to control GPIO has been removed from JP6.x (K5.15.x), but you can use gpiod instead.
Please refer to Issue with GPIO Loopback Test Failed JP6.1 L4T36.4.0 with Orin Nano SOM 4GB Custom Carrier Board - #18 by KevinFFF for the steps to verify.