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The 60/50Hz problem only occurs if you try to use the UPS completely without mains. In this case it starts with 60Hz.
You can try: Have your UPS completely switched off and disconnected from mains. Then press the 'on' button until the UPS beeps and release the button during the beep. The UPS will run from battery now. Listen to the sound it makes and then connect mains. You will hear the change from 60Hz to 50Hz.
Anyway, operating without mains is not a usual case...
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