GPIO access via Legato application

[rio99]

read here

Problem exporting and accessing GPIO42

Hello, I have problem with GPIO42, I am trying to export GPIO42 such way: echo 42 > /sys/class/gpio/export but Legato responds sh: write error: Device or resource busy I have already configured GPIO42 using AT command AT+WIOCFG=42,16,1,1,0,0,0 but i still receive this error, how can I unlock GPIO42?