I have exactly the same:
when trying to switch on, the screen flashes a couple of times white, then black, then white, then black and remains black. The green led stays on. The device remains invisible for my compu.
I tried many combinations of key presses and resets, but to no avail.
The only way to get the green led off is to press the OK button (centre of navigation button) and reset.
I do not have a suitable sd card to try and load the FW, but am pretty sure the latest version is loaded. The device is charged
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