I was in a well lit room and half distracted, so I have no idea if mine went out or not, but...
PURE SPECULATION FOLLOWS....
Having a battery die during a firmware update is bad news and can brick the device. It's possible that they turn off the light to reduce current draw as much as possible to increase the likelihood of success. It's also possible that during update they shut down all unnecessary system services, one of which controls the light.
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