As you already know its a reported known firmware bug with the NAC unit, take it back its under manufacturer warranty.
It doesn't affect every PSA Peugeot / Citroen product with NAC, seems to be an odd bug.
That's also why I haven't updated the firmware on my NAC unit as I don't want the protentional of this bug.
Its always an idea to let others apply any new NAC firmware first then wait a few weeks to see if any bugs do get reported as you cannot roll back to a previous working NAC firmware version!
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