tomato shibby after seting the vpn the 2.4G wifi disappear

I path Tenda W1800R to Tomato shibby. before the VPN setting the wifi work well. But after i setting up the vpn the 2.4wifi disappear in the web setting. also the 5G one some data also request to set again.
the Tomato Shibby firmware I use is 121aio
the following
http://tomato.groov.pl/download/K26RT-AC/121-EN/tomato-W1800R_RT-AC6x--121-AIO-64K.trx
is it best to use the vpn version not use the AIO