[Simple]

To make DiagBox check the VCI firmware and update if necessary,

Precaustion:
Copy or move all files (NOT folders) inside "C:\AWRoot\bin\Launcher" to a safe location before perfoming the following:

1- Download "Launcher.rar" from the link provided
2- Create a back-up of all (only) files inside "C:\AWRoot\bin\Launcher"
3- Extract all files into "C:\AWRoot\bin\Launcher" replacing/overwriting existing files.
3- Rename your preferred Firmware inside Launcher folder to APPLI.COM
4- Connect your XS Evolution VCI and wait until it is recognised
5- Launch DiagBox, it will check the VCI Firmware and update ONLY if necessary.

The update function can be disabled by setting "MAJ_COM=TRUE" to "MAJ_COM=FALSE" in "C:\AWRoot\bin\Launcher\ap.ini"

In case reverting to the original setting is needed,
1- Delete all files (only) inside "C:\AWRoot\bin\launcher".
2- Restore backed-up files back to their original state.

Note: Some users may be afraid that a damaging APPLI.COM may be included in a future update release. It does not matter if this is feasible or not, you can change AP.INI settings to disable firmware update after performing your desired update and put your mind at rest.

Simple !..