"Spec version not supported" Error

If you encounter this error when using your Ledger on the Polkadot-JS UI, it means the Polkadot app on your Ledger needs to be updated.

1. Open the My Ledger tab in your Ledger Live app, and install any available updates: 

2. You should see the Polkadot app being updated:

3. This should solve the issue.

If you are more of a visual type, check this video on how to update your Ledger apps: