STATIC ROUTE NOT WORKING ON BIG IP

I have read the documentation but i maybe i should clarify my question. In this environment i am working on, they got private addresses from a telecoms operator, 10.114.114.x/30. These private addresses are only routable to an internal network 172.20.238.x/24 such that from wherever the owners of the telecoms ip addresses are, they can make a request to any host on the network 172.20.238.x/24. This network 172.20.238.x host is then nated by a firewall to the internal servers. This was their existing architecture. Now, the firewall is being replaced by F5 as a hop to the internal servers to which requests will be made. Because i have set a vlan self IP of 172.20.238.5 on the F5 and a virtual server ip of 172.20.238.8 on the F5, and mapped it to the pool where the internal servers, the telecoms private address hosts can reach the F5 through the VIP and the interface. But the F5 cannot reach the telecoms private address. I set a static route so it knows how to reach it but F5 still doesnt go that route. So even though from F5 i can ping the next hop Router interface above the F5 on 172.20.238.9, i cannot Ping 10.114.114.170 which router above F5 points to.