Hello! Since we posted our last update a little over a week ago we’ve updated the Ledger SDK they apps are using and we have been expanding the size of operations the app can sign. We were previously only able to sign operations with four inputs, but that number is effective unbounded with this change.
We also submitted another grant for Hardware Wallet Support in CKB-CLI and Additional Ledger Features. Once that’s complete you should be able to use the app on mainnet.