If you ever want to remove the Ravencoin app from your Ledger, do it with:
python -m ledgerblue.deleteApp --appName "Ravencoin" --targetId 0x31100004
== A word about derivation paths ==
When you access Electrum with your Ledger, it may ask you for a path. m/44'/175'/175' was the path from the original Ledger firmware. If you ever have a situation where you can't see your coins, try this path.