I-O DATA HFAS1-XS20U Setup Manual page 28

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2. Getting More out of this Unit – 2.10. Keeping the Firmware/Software of this Unit up to Date
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Click [Yes]
The front indicator blinks.
Do not turn off the power while the
front indicator is blinking.
Do not stop power supply by unplugging
the power cable or switch off the power
tap.
Confirm that the front indicator is lit.
This completes the setting.