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As I stated earlier, 'Download' mode (and in fact all three debug modes) aren't working on my eReader. If I hold the power button down for the instructed 3 sec, it just boots into 'normal' mode, if I hold it down for longer, it becomes non-responsive for hours/days, but does not present as an 'HID compliant device' when connected to a PC.
Given this, and the fact that (more than a day after my previous attempt) my eReader was still unresponsive, I sent it back to Onyx Boox yesterday.
Given the sequence of events (1st flash: slight problem (Google Play doesn't work); 2nd flash: severe screen problems; all further attempts to get it into any debug mode to further reflash giving idiosyncratic results), I'm beginning to suspect that there is some flaw (hardware or software) affecting this particular device's low-level functionality, with reflashing attempts causing the problem to 'snowball'.
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