Flirc Version v1.2.2 [v1.2.2]
2.3 01-25-2014 [0x3DB4D4F3]
When I want to record \ (backslash) key, I select it in the Controlers > Full keyboard.
The key is green (Press the button to be paired with 'backslash'), I press the remote button (Recorded successfully).
I test it and press again the remote button and the #3 key turn green not the \.
./filrc_util settings says hash: 5BF9F14B key:/
I did the test few times and after reboot my Linux box.