Debricking a sagem F@ST2704 V1

I am a novice at this & I would appreciate some expert help here.

I have just installed openwrt-18.06.2-brcm62xx-smp-FAST2704N-squashfs-cfe.bin on a Sagem F@ST2704N & bricked it whilst trying to configure it.

I have managed to access root using address via SSH but I cannot rejuvenate the module.

I have tried mount_root, firstboot && reboot now and umount /overlay && jffs2reset && reboot now but none of these result in the device responding.

Any advice on what I am doing wrong would be appreciated.