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On the first 600, I got the calibration screen when I first switched the unit on, after charging it. Then, after a day, it stuck at the welcome screen after doing a hard reset to fix a problem with it. The second 600 won't even get into the calibration mode, it just locks st the welcome screen, like the fist one did after a days use. I can't use any of the buttons for menu etc, except to do do a hard reset. The second one has had no use at all.
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