If you use Ledger with a software wallet like MetaMask, Rabby, or Phantom, there's a quiet upgrade happening in the background. It's called the DMK, and it's how the next generation of software wallets connects to your Ledger signer.
Most major wallets are already on it. If yours isn't yet, you may find signing transactions may stop working until they ship the update. Your keys, your recovery, and your device are unaffected. This is a wallet-side upgrade.
Check what your wallet's doing. If they haven't said anything, ask.
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