RPi3: 6lowpan_control "Permission denied"

Question

I am trying to use one of the example from NRF5 IoT SDK with RPi3 (kernel 4.9.41-v7+) but keep getting "permission denied" when execute command below: 
 echo "connect 00:5A:FD:06:8D:8E 1" > /sys/kernel/debug/bluetooth/6lowpan_control 
 Actual error I got: 
 bash: /sys/kernel/debug/bluetooth/6lowpan_control: Permission denied 
 I read and follow steps suggested using links below but pretty much stuck. 
 
 
 devzone.nordicsemi.com/.../ 
 
 
 developer.nordicsemi.com/.../a00089.html

bjorn-spockeli · Accepted Answer

There is a typo in the last command, 6lowpan_contol instead of 6lowpan_control 
 Could you try executing the commands in this order 
 modprobe bluetooth_6lowpan
echo 1 > /sys/kernel/debug/bluetooth/6lowpan_enable

# Enabling IPv6 Forwarding
echo 1 > /proc/sys/net/ipv6/conf/all/forwarding

# Restart radvd service
sudo service radvd restart

echo "connect 00:6B:FD:06:8D:8E 1" > /sys/kernel/debug/bluetooth/6lowpan_control