What I've tried so far (using mSATA disks with a PATA adapter):

- I used your upgrader to extract the parts from the upgrade file.
- I used your download to write the various flash parts.
- I managed to persuade minicom to drop me at the "pump>" prompt, and got it to partition the disk, but it turns out that the protocol for sending disk images is a bit awkward, and basically impossible to sanely script in minicom. And I don't feel like writing any (probably Python) code this evening.

So: I've ordered a USB-to-mSATA adapter (as in: I literally pressed the Checkout button as you posted those binaries), which should arrive tomorrow. I plan to apply the disk image using that.