Have you tried Placing the device in Recovery Mode (unplug the device then hold down the volume button while plugging device back in. Release the volume button once the device turns back on.) Attempt a factory reset once the device boots into Recovery Mode (hold down both volume up and volume down buttons at the same time.)
FWIW i was instructed to take videos of the device not responding to me and I never once heard back regarding those. Stop making people jump through hoops when you know the only fix is a replacement. The update you pushed out 4Q21 bricked a huge chunk of your first generation nests. You should've owned up to it and fixed it 2-3 months ago. Who holds on to a device that doesn't work for months? No one.
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