Argh!

My trusty Psion Series 5mx just reset to factory settings when I was changing the batteries.

I got it back in 2001 and used it for many things until I moved on and it simply became an overly complex alarm clock. But it still had all the files and documents on it and I took it for granted that it never crashed or had issues and until today, it had never been reset since I put the first set of batteries in it all those years ago.