Version 4.9.0 Update Nbn Mtu loop Flint 3

Updated to 4.9.0 on my BE9300.

Running via pppoe (pre June 2025 when the switched) through the netcomm provided router from Tangerine. Netcomm set as bridge.

Ran perfectly before the upgrade.

Worked once after upgrade, but only the lan, wifi did not pass through to internet. Then rebooted and now stuck in the mtu loop problem. 1492 is the standard for this isp.

Attempted everything I could think of and try from suggestions, and now really trying to avoid factory reset and upgrade to 4.8.4 and leave it there.

Any suggestions would be appreciated 🙂