After many years of sterling service my 2110n needed replacing.
I bought myself a 2762ac. Going through the wizard the web interface told me it needed a reboot after saving the settings.
That's when things started going south. Now it's doing a reboot cycle every 30 seconds .
I've gone through the factory reset several times. I see the fast blinking it resets. Then back to rebooting every 30 seconds.
During the reboots there is a window of 10 seconds where I get an ip address. The management web page does not respond.

I suspect it's bricked and needs to be sent back to the site I bought it from.
However any suggestions would be gratefully received.

The firmware recovery method https://www.draytek.co.uk/support/guides/kb-firmwarerecovery doesn't seem to apply to that model. An email to support?

With nothing to loose I followed your advice.
Thank you very much this did the trick the router is now online.
For information I used the *.rst file so any settings that were upsetting the router are now set to defaults.

Thanks very much

I was seeing a regular reboot - until I removed the USB stick - turned out the file system on the USB was corrupted. Reformatted the USB and now all OK.