[B.A.T.M.A.N.] no able to switch routing algo to V ?

Hello,

I just got openwrt 15.05.1 with batman-adv 2016.1 on 3 picostation HP, this time a selected before the build of openwrt batman V option, I can see it when it ask for available routing algo ,

root@OpenWrt:/etc/init.d# cat /sys/kernel/debug/batman_adv/routing_algos Available routing algorithms: * BATMAN_IV * BATMAN_V

but when I do :

echo BATMAN_V > /sys/module/batman_adv/parameters/routing_algo

It does nothing, still on BATMAN_IV during session and on reboot ?

sysctl -a does not show any routing_algoritms param for batman-adv ?

Best Regards,

Laurent