Internet not working

[Satyam1]

Hi Guys,
So we were using a router with two VLAN 10 and 20, connected to two different APs and everything was working fine.

Today we purchased a firewall and we placed it before the router (refer to the image). I created two static routes 192.168.110.0 with Gateway 192.168.100.2 and 192.168.120.0 with the same Gateway. Still, we are not able to access the internet.

Any idea what I am doing wrong? Any other way to configure this whole setup?