What is the difference between RC channels and disarmament。41 and 153（4.2 and higher）

ArduPlane Plane 4.2
1

What are the differences between different locking options in version 4.2 and later?

In version 4.2, RC6_OPTION What is the logical difference between option selections 153 and 41?

2

Option 41 is for version <4.2 153 is for =>4.2

3

But my 4.2 version uses 153 way and can’t disassemble it. Instead use 41 to disassemble

4

https://ardupilot.org/copter/docs/common-auxiliary-functions.html