Problem solved!
Summary:
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Do not attempt iBlinds OTA firmware update on iBlinds included with S2 security enabled.
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Probably shouldn't include iBlinds with S2 security enabled. (I believe that this has been recommended elsewhere.)
Problem:
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Attempt at iBlinds OTA firmware update with S2 security took five hours and failed. Solution: See below.
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iBlind woke me up with high-pitched whine. Opening the blind stopped it. Battery indicated 1% when it should have been 60-80%. I suspect that the five hour attempted firmware update drained the battery but I do not know for sure. Solution: Recharge battery.
Details:
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Exclude the iBlind from Hubitat.
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Do a Factory reset on the iBlind using the IN/EX button on the motor. (Press 5 times)
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I restarted the Hubitat for good measure.
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Re-discover the iBlind. I used the IN/EX button on the motor to start inclusion. (Press 3 times)
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Uncheck all S2 security boxes during discovery.
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I restarted the Hubitat for good measure.
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I tried the OTA firmware update again, 3.01 to 3.06. It took about 25 minutes. No problem.
Also,
I powered down the Hubitat and moved it near the iBlinds and unplugged the nearby repeater before I plugged it back in.
As a complete novice I would advise doing the OTA firmware update only Z-Waveing directly to the Hubitat no matter how wonderful your Z-Wave mesh might seem.