sorry just for understanding, is the hsm secret stored on the SD card , or on the hard drive? I guess an update would not impact the hsm secret?

and also, once unlocked, it stays unlocked?

really appreciate your feedback

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The hsm_secret is basically your CLN onchain wallet is on the disk together with the other user data.

The OS lives on the SDcard amd it can be changed at will - the system is designed to recover the data from the disk.

The CLN wallet (if encrypted) will need to be unlocked after every restart of the node.