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Switch off the device
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Press button FRES and keep it pressed. Button is in the hole of the case, so you will need appropriately long and thin "tool" e.g. pen.
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Switch on the device
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After 30 s realese the button (depress it)
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Wait for OFR to boot.
When you finish it, you will have the default IP address. It has been 10.0.0.1 till version 2.3.1. Since 2.3.1 default IP address is 192.168.1.1.