I also had a problem installing 6.5 and had no other issues up until now.

I had to delete the two document files, and uninstall 6.4, and was able to install 6.5

However, the Document files were not restored.

Maybe they are missing? Either way, that might be part of the problem

EDIT: Going to /opt I was able to find the two PDF files, but they won't open on the phone saying they are corrupted.

Maybe check those? It seems to be the issue that people are running into.