@Sessa45 : a solution might be :
Re install the last released version - something like 2.4.4. p1 - and make WAN work.
Do nothing else.
Do not import your config.xml.
Now, upgrade to the bleeding edge : update to the 2.5.0 snapshot.
When all is ok, upgrade, reboot, etc, import your config.xml.
Btw : I wonder : pfSense "2.5.0" snap shotted should work. But you better be sure that all the packages you use are also "2.5.0" ready ...