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For devices running firmware with version 3.8.6 or greater
To initiate factory reset, press the following buttons subsequently: S.INFO, 4, 9, S.INFO or FN, 4, 9, FN. Then press OK. STB will reboot.
For devices running firmware with version lower then 3.8.6
To initiate factory reset, press and hold Power key on the IR remote for 5 seconds. Then press OK. STB will reboot.