This article explains how to troubleshoot the "Something went wrong. Please reconnect your device. Txn version not supported" error.
Ledger Live desktop error
Ledger Live mobile error
Troubleshooting:
This error happens because the Polkadot (DOT) app installed on your Ledger device is outdated.
To fix this issue, please do a complete update of your Ledger system including updating the Polkadot (DOT) app to the latest version.