Hi, a few years ago, when Mio 4-digits(f.e. 6900,4800) arrives on the market , we encounter the prpblem with unlock it. Panel from SDcard works fine ONLY when we insert it into powered on Mio unit. Founded exception - working "normally" with f.e. SanDisc Ultra 16GB and a few others HighSpeed microSD - but not all. And with not all of 6900 Problem disappers in models like 7500 and 8500 unit.
So, fully power on the unit, next insert sdcard. Or, try with different highspeed microsd.
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