How do you update or synchronize the Neon wallet? There's no such option to do that when I log in with my Ledger.
I heard that there was some kind of 'migration' to a new Neo wallet a couple of years ago. Is there a chance that I lost my Neo because I failed to 'migrate' to the new wallet on time?
It transitioned from Neo Legacy to Neo N3 and users had to manually migrate their assets. If your Neo was still on the Legacy chain and wasn’t migrated before the deadline that could explain why you’re seeing a zero balance now.
I’d recommend checking a Neo Legacy blockchain explorer using your wallet address to see if your tokens are still there, you might need to go through the manual migration process (though some deadlines for incentives have passed).
Ensure your Ledger firmware and the Neon wallet itself are updated, the official Neo community or support channels might be able to guide you through your options.