[JackPack]

I'm a bit reluctant to open another thread like this, but this is a bit peculiar and I've been all over the forums and web the last several days with no resolution and am out of ideas.

I have two model EY21 Gen 1 3G PaperWhite demo units I am trying to undemo/unbrick. I've tried multiple methods, and they all appear to have the same result: Any updates just do not take effect. They are both apparently running 5.2.0. Symptomatically, one seems fine, just in demo mode, the other is in a boot loop, and has a corrupt diags image (bootm 0xE41000 fails with bad CRC). I have serial console so can see everything, use uboot, CLI, etc. I have tried:

- interrupt uboot, boot diags image, USB mode, copy file, dd to mmcblk0p1
- boot to recovery menu, export to USB, copy file, dd, etc.
- the above using an update*bin file including the latest 5.4.4.2 directly from amazon
- fastboot, flashing both main and diag kernels, and main and diag partitions
- probably a few other permutations of the above

I have done this on a linux VM, Win7 VM, and OSX native. Nothing seems to change. It's almost like it's silently write protected, or there's an unlock that needs to be done. I kind of doubt that both units (and actually I have a third, so far untested) have exactly the same failure (if it's a failure).

I would appreciate any suggestions. Thanks!

Jack