I have an error coming up constantly:

"Device storage full, unable to send or receive messages."

However:

1) When I try to delete messages through the Conversations application, not all of them are able to be deleted. They don't disappear after being deleted. Sometimes even clearing the conversation doesn't work.

2) RootFs is showing up as 70% used, and 30% free. So I don't see how this is an issue.

Is there a way to manually delete the messages in conversations through terminal??

A re-flash is not an option, since my USB port broke (in the same fashion as all the others).