In reply to:

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I believe that he's attempting to install hijack via the serial cable after upgrading to beta13

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Oops, I shouldn't believe that I can remember everything with a quick glance at the subject line. My advice is only good for uploading logos (or, by using /proc/empeg_kernel, kernels) with Hijack already operational.

But the good side is that you (thinfourth) know that your serial connection works, as you managed to apply the Empeg upgrade file. Chances are, you're suffering one of the usual annoyances, like having some other process holding onto the port.