So my question is how can I restore this backup reliably? I've thought of a few possibilities:
- Rename the .ima to .img and try the standard restore procedure with Diskimager. I think the trouble I had with Diskimager in the first place was that it didn't recognize my computer's built-in card reader. That shouldn't matter with the Nook attached. But I'm not sure whether or not Diskimager will read the renamed .ima correctly, and by the time I find out with the standard procedure, my NST will be a brick.
...I did a trial restore using Diskimager from the renamed .ima (to .img) onto an SD card, and it appears to have worked fine, at least the progress bar was consistent with restoring the whole thing and Partition Wizard reports all the right partition sizes. (Windows can only see the first one.) So assuming there are no other gotchas, the standard instructions ought to work, just substituting Diskimager for Diskimage. Right?
Here's a follow-up report, FWIW. After that successful trial restore, I went ahead and used Diskimager to write the .img directly to the NST. All seemed to be fine until I tried to refresh the library. After spinning for a while, it reported an internal error, exception while trying this operation. All other wi-fi functionality was intact.
To fix this, the first thing I tried was Touch-Formatter via CWM. That seemed to run successfully. It reverted the NST to firmware 1.1.0 and required me to re-register. All okay. But then when I tried to connect via USB to install the 1.1.2 update, I couldn't get a stable USB connection. The "USB Mode" window never displayed on the NST, and Windows would see the attached devices, but the contents would only be visible occasionally for a few seconds. The rest of the time it would say "no media." Not cool.
So I thought it couldn't get much worse, and I fiddled around with a couple of the other things on the CWM thread, including ROM-backup (in case of having to reflash a total stock image), and ending with install_stock_1.1_recovery.
Now finally everything seems all right. I do get the USB Mode pop-up and a stable connection. I was able to copy the 1.1.2 update file onto the device, and it updated normally.
I've no idea why the initial restore didn't quite work or what little tweaks actually happened on the way to total recovery, but maybe someone can learn from my odyssey.