I'm trying to set routerboard 951 (AP bridge) to router mode with this configuration:
-Mode: Router
-WAN Address acquisition: Static 192.168.0.X/24
-WLAN ip address: 192.168.88.1/24 dhcp server enabled 192.168.88.2-254

There's no way to get internet access!
On the other hand if I set wan address acquisition to DHCP everythings goes fine.
Why I cannot bridge connection??

Yes, You did not specify the default route in ip route.
When you set it to dhcp, it add default route automatically but when using static, you have to specify your gateway.

just add the following,

ip route add gateway=192.168.1.x

ie your gateway ip.

if you mean when I set static acquisition I specify everything I think:
ip address=192.168.0.100 subnet=255.255.255.0 gateway=192.168.0.1
so I think it's no a gw issue

ip address=192.168.0.100 subnet=255.255.255.0 gateway=192.168.0.1
so I think it's no a gw issue

I dont know id this is the exact command you use or it is just a shorcut.
however, the correct command is this.
ip address add address=x.x.x.x netmask=x.x.x.x interface=xxxx1 [enter]
or
ip address add address=x.x.x.x/x interface=xxxx1 [enter]


and to add route do:
ip route add gateway=x.x.x.x

You can post your winbox view of the ip route or print it.

I also add ip route add gateway 192.168.0.1.
but still no internet connection! where am I going worng?

please anyone?