i Am able to control and read the PINS 66 67 68 69 like that but NOT 115 117 49 20 any advice how ca

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1

i Am able to control and read the PINS 66 67 68 69 like that but NOT 115 117 49 20 any advice how can control that

my Image is
oot@beaglebone:~# cat /etc/dogtag
BeagleBoard.org Debian Image 2016-01-24
root@beaglebone:~#