Hello alzhao,
Thanks for the answer
I can not delete the ipv6 because the VPN provider Hide.me requires this.
pull-filter ignore "route-ipv6
pull-filter ignore "ifconfig-ipv6
I already added this to the openvpn, but then I couldn’t find the openvpn page with the start/stop button under Luci it was empty.
Have already written with the support of hideme also he does not know more further.
Today I installed openwrt-19.07.5-ramips-mt76x8-gl-mt300n-v2-squashfs-sysupgrade.bin on the router.
The VPN runs fine over LAN but wireless does not work.
So the problem is the firmware of the router with the ipv6. Since without this firmware it works but wireless does not work.
This is the error message and it uses the same wireless settings as the original firmware.
/etc/init.d/network: mt7628(mt7628): Interface type not supported

with kind regards
Thomas45