Lost low level device name

I'm unsure of the cause, but I have somehow lost my device's name. This is not simply a problem with build.prop or other higher level editing. This must be at a lower level.
When attempting to flash the stock rom (something I have been able to do many times), TWRP returns error messages:

This package is for "N958St" devices; this is a " ".
E: Error executing updater binary in zip '/external_sd/ZTE_V5_Max_official_V1.35-update.zip'

Is there any way to rename the device back to what it is supposed to be?

Incidentally, I am able to restore my backups, but not install any number of other roms, since they apparently check that name.

Thanks for any help you can offer.