Change inputs for Vectrex games

[A Former User]

Hi all,
I tested many things but I probably have to miss something even if I read articles.
I have configured my inputs and obtained an autoconfig file. All is working perfectly.
--- /opt/retropie/configs/all/retroarch/autoconfig/Xin-Mo Xin-Mo Controller.cfg ---
input_device = "Xin-Mo Xin-Mo Controller"
input_driver = "udev"
input_l_btn = "5"
input_load_state_btn = "5"
input_start_btn = "9"
input_exit_emulator_btn = "9"
input_down_axis = "+1"
input_r_btn = "4"
input_save_state_btn = "4"
input_right_axis = "+0"
input_state_slot_increase_axis = "+0"
input_select_btn = "8"
input_left_axis = "-0"
input_state_slot_decrease_axis = "-0"
input_up_axis = "-1"
input_a_btn = "0"
input_b_btn = "1"
input_reset_btn = "1"
input_enable_hotkey_btn = "8"
input_x_btn = "3"
input_menu_toggle_btn = "3"
input_y_btn = "2"

I would like to invert btn_a and btn_b for Vectrex games. So I change this file like this:
--- /opt/retropie/configs/vectrex/retroarch.cfg

Settings made here will only override settings in the global retroarch.cfg if

placed above the #include line

input_remapping_directory = "/opt/retropie/configs/vectrex/"
input_a_btn = "1"
input_b_btn = "0"
#include "/opt/retropie/configs/all/retroarch.cfg"

No inversion.

I tried to add all the content of autconfig file (just changing btn_a and btn_b).

But nothing is working for now (no inversion at all). I think I have forget something. Could you help me, please ?

If I invert btn_a and btn_b into autoconfig file, I obtain inversion... but for alla games of course...

Here is my config:
Pi 3 B+ / RetroPie 4.4 official image (retropie-4.4-rpi2_rpi3.img) / Emu 2.8.0rp-dev.

I don't know what is wrong. All seems logical for me.
Thanks for your help.

[A Former User]

I finally used the retroarch menu (Select+X) and remapped the controls here. It works fine.
I think that the problem was the special syntax for Vectrex.