What you can try is to (re-)install the firmware: this worked for me when my 902 got frozen (see my post elsewhere in this forum).
It doesn't matter if you already have the latest firmware: the act of re-flashing may reset your device.
If you can't copy files to your 602 using a PC, use a MicroSD card with the firmware.
If your 602 doesn't recognize your MicroSD card anymore, try removing the battery, if you can, wait for an hour, and attach the battery again.
That's all I can think of for now.
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