I've seen the reports of eMMC issues- that was the first thing I expected to be the problem. Thank you for the suggestion- I might try working this out with bare FreeBSD once I get a replacement device. At this point I'm going to just start looking for some new hardware- it's time!
In the meantime, I was able to successfully reinstall 24.7, upgrade to 24.7.12, and restore an old backup so things are at least running again. Did tempt fate by trying to use the webgui to upgrade to 25.1 again, and it failed again, so it looks like sticking with 24.7.12 for the time being is my only option with this device.
In the meantime, I was able to successfully reinstall 24.7, upgrade to 24.7.12, and restore an old backup so things are at least running again. Did tempt fate by trying to use the webgui to upgrade to 25.1 again, and it failed again, so it looks like sticking with 24.7.12 for the time being is my only option with this device.