If the device was rooted ( I had a similar issue on my Era) you need to download this release of the PB root
https://github.com/ezdiy/pbjb/releases/tag/v6
This has an Uninstall script that you can run.
To fix this I did this:
1. Put the files in the /application folder
2. Assuming the root is still somewhat installed, ssh to this folder.
3. Run the JailBreak.app
4. Run the services.ap
5. Run the Uninstall.app
6. Delete the /mnt/secure/su folder
7. Try to do the force update/reset with the buttons again
8. Once it starts give it 5 or so minutes. I noticed it took a while to have the touch screen react again