Yeah, my 600 locked up the day after i bought it, it was fully charged, I tried all the ways to reset it, but nothing worked, so i took the back off and unplugged the battery, and it`s worked fine since.
It`s easy to get to the battery on the 600 , you only have to remove 2 screws and then slide off the back, and then just unplug the battery, the only problem is the screws are tiny and if you dont have the right screwdriver and make a mess of them your guarantee is gone.
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