Sysupgrade for custom platform

Hi,

We are upgrading our system using the WebUI. For our custom change we wanted the files in the /etc to also get updated when performing the update. So we have modified the SAVE_CONFIG in the sysupgrade file to 0. After this change we are observing the changes getting reflected. But what we wanted is the files in /etc/ must be replaced when upgraded but it should not upgrade the wireless files.
Is there any method only to retain the wireless files when performing the sysupgrade.

you could try to add it to /etc/sysupgrade.conf

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Tried as suggested by adding the file to the /etc/sysupgrade.conf. But performing sysupgrade am not able to see the old configuration for /etc/config/wireless retained.