After doing the HTC Dev Unlock, the preload folder has been cleared and I cannot install OTAs because verifying the system fails.
Now the problem.
I cannot go S-Off, not with firewater nor with rumrunner. So no chance to install a full RUU.
I cannot find any version matching Nandroid backup containing the missing preload files.
What can I do? I don't know any other way to get the preload files. If I could find someone with the matching version, it would be very easy. But I doubt there's still somebody with this old version.