@tati thanks a bunch, You are a lifesaver! This did also worked for my wrt32x (of course I had to use http://downloads.openwrt.org/releases/17.01.6/packages/arm_cortex-a9_vfpv3/packages/libudev_3.2-1_arm_cortex-a9_vfpv3.ipk with --force--downgrade option)