The only thing I have found failed is the 4.7k resistor for the power LED. But as I got the drive to actually boot and run a software update, the only thing to check now is the ibus is getting where it is meant to be.
With any luck I will get it working, I was worrying about it being a software problem.
Some photos of the underside of the board would be great, I was thinking I'll put a smoothing capacitor back in, but I really can't see a reason. There must be a good one, as it is truly squeezed in and vias aren't cheap.
I have a couple more traces to follow, I suspect the UART chip is also at fault. But I will check that in good time.
I think I got it cheap at £65. The seller was certainly in a rush to get it to me.
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ZT-T 190
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