Escaping watchdog errors on ADuC7021

I've got my ADuC7021 prototype board stuck in a state where I can not erase or re-program it over JTAG.

Whilst implementing the watchdog I ended up with a watchdog countdown a couple orders of magnitude down from where it should be. As such it watchdogs and resets before the JTAG can get in and get control to erase it.

How do I get out of this one!?

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