by delete and re-add, i think 325 means you should exclude it and then include it with the dongle, this should always be done before attempting to use "remove dead node"
you dont even need to reinsert the dongle between including and excluding, just:
take the dongle to the device,
HOLD the dongle button down until the blue light blinks fast,
press the activation button on the device,
wait for dongle to finish exclusion.
press the button on the dongle until it is in include mode (slow blinking),
press the activation button on the device again,
wait for the dongle to finish inclusion,
reinsert the dongle to vera.
note: you will have to redo any scenes or events/notifications that use that sensor/device