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IoT SDK - cannot connect to nrf51822 using newer linux kernel

Hello, Connection between linux router and NRf51 devices worked before I've updated kernel version from 4.09 to 4.3. Now, with the same configuration and hardware, I'm not able to create a link:

root@ap-3:/home/pi# hcitool lesson
LE Scan ... 
00:34:3E:DF:03:90 COAP_Client 
00:34:3E:DF:03:90 (unknown) 

root@ap-3:/home/pi# echo 1 > /sys/kernel/debug/bluetooth/6lowpan_enable
root@ap-3:/home/pi# cat /sys/kernel/debug/bluetooth/6lowpan_enable
1
root@ap-3:/home/pi# echo "connect 00:34:3E:DF:03:90 2" > /sys/kernel/debug/bluetooth/6lowpan_control
bash: echo: write error: Connection refused

Does anyone know what could cause the problem, or/and how to solve it? Maybe in new kernel there is some other way of using debug interface for bluetooth 6lowpan? I can't find anything.

Thank you in advance, Michal