I am getting a spare ecu and the current owner said it may have a Revo tune on it. However, he can't verify if it does because he bought the wrong ecu and it won't work in his car. Apparently, it was flashed before he bought it. Either way, I'm getting a good deal for a spare ecu. So what can I do to check it?
After reading the flash (probably you'll have to do that in boot mode), search for the string "Revotechnik" in the binary.