Hi amaranil1996,
Please refer to the following patch, which is the one when we added the support for super mode board config.
0001-TEST-ONLY-support-super-mode-for-image-based-OTA.patch (7.2 KB)
You can add your custom board config to the similar lines.
e.g.
Your custom board config called: custom.conf, then you can find where we added for jetson-orin-nano-devki-super and you can replace them with custom