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Solving the UNKNOWN_ERROR (0x650f) in MetaMask

This article describes how to troubleshoot UNKNOWN_ERROR (0x650f) which might trigger when connecting a Ledger device to MetaMask.



  1. Close Ledger Live.
  2. In MetaMask, go to Settings > Advanced, scroll down to Preferred Ledger Connection Type, and select WebHID.
  3. Make sure that your Ledger device is unlocked and not on screen saver.
  4. Open the Ethereum (ETH) app on your Ledger device by navigating to the Ethereum icon and pressing both buttons simultaneously.
    Your device displays: Application is ready.open_eth_app_new.gif
  5. In MetaMask, go to Settings > Connect Hardware Wallet, select Ledger and click Continue to attempt the connection again.

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