Find the thread on Recovery Console.

Then look at my directions for adding shell-access early at boot. Part of that code (it's explained through-out posts preceding my tutorial) deals with what you need to stop the watchdogs from rebooting the device.

For now though, if you can't get past the dialog and boot all the way because of this, use flasher to set R&D Mode to on and the no-watchdog flags to on, so that you can boot up once to get to that point.