My Ui24R doesn't change the hour/date

I've tried this many many times without success...
On OPTIONS/SETTINGS I set the time and set the date, but when I record with the mixer, the data on the usb file keeps showing the 25th july 2016...
Seems that the mixer can't keep the new data by its own...
Maybe the mixer has a battery to keep the data and I have to change it or something?

Regards.

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