Hummingboard 1 - GPIO not working

Hello,

i have Hummingboard 1 with mainline kernel 4.11.6.

And i have problem with GPIOs, after exporting GPIO 72 (also i try 73,71,1 / pin 11,13,7), set direction to OUT and value to 0 i have still 3.3V on pin 12 (11,13,7...).

Also try 72 as OUT value 1 and 73 as IN ... and short this pins 11-12 by wire.

gpiochip2: GPIOs 64-95, parent: platform/20a4000.gpio, 20a4000.gpio:
 gpio-68  (                    |PCIe reset          ) out hi
 gpio-69  (                    |gpio-ir-recv        ) in  hi
 gpio-72  (                    |sysfs               ) out hi
 gpio-73  (                    |sysfs               ) in  lo
 gpio-83  (                    |brcm_reg            ) out lo
 gpio-86  (                    |usb_otg_vbus        ) out lo

73 read as LOW.

Also i try wiringX and test app "wiringx-read 1 0":

running on a hummingboard
Writing to GPIO 1: High
Reading from GPIO 0: 0
Writing to GPIO 1: Low
Reading from GPIO 0: 0

please help me :-)

thanks.