Yes --- the TYPE=prod was the problem! The new images link at 0xf8007000, and they download and imx_usb is reporting that it's apparently run them. Thanks very much!
However I say 'apparently' because while I can see the USB connection disconnect and then reconnect, I see no serial output from it. Apparently nothing worthwhile is easy?
So either it's working but the console output is getting lost, or it's not working and execution is returning to the ROM, which is going back to download mode without producing another banner.
Incidentally, when (if) I ever get this going, I plan to write this up and produce a cleaned up works-out-of-the-box uboot version...
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