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Have it hooked to a UPS
Doesn't matter. Most of them are cheap standby models. Because you appear to have corrupted data, you almost certainly don't have a true sine wave on-line UPS or even a line interactive one. If you obtain remote reprogramming support from someone here without replacing the memory support battery, you will need to purchase a better UPS before proceeding.

- Dave S. -

You can never appease your ideologue opponents.