This video Goes over the basic functionality of a Dejavoo P1.
How to run a refund.
How to remove the Fee from a transaction.
How to update the terminal.
How to look at a batch, and settle the batch
How to check if the terminal is connected to internet.
https://www.youtube.com/watch?v=3maLdpgD1Qs&list=PLV_F8VtJPlc0tokPJHqHM4WsKZJpSuaZw