Fallback access Client in bridge mode

I have SXT Lite5 set as client in bridge mode with static wan ip address (e.g 192.168.1.XX)

When CPE losts its connection to wan network I can’t access to it anymore.
Neither with mac address nor with my pc and static address configured.
Why? How to solve this?
Thanks

on bridge set admin mac address the same mac as ether1
and check the IP, must be assigned on bridge, not on interface on bridge.