Thanks, if I could award you I would! Can see you’ve put a lot of effort and detail in

I managed to use TFTP2, get a ping and Upgrading flash status with progress for about a minute, until it goes to erasing flash stage, then I can see in CMD the ping fails (that’s handy to see anyway), still with the Asus firmware (I don’t think I can use third party). Had a few attempts with different versions and all still failing.

The TTL cable is maybe a step too far for me. Think the router may be going on eBay!

Still thank you