1. Download the Ledger live app on your computer (Mac, Windows, Linux)2. Update the Ledger live app and Ledger firmware to the latest version (make sure that Dev mode is disabled while updating)3. 'Go to Settings' -> 'Experimental features' -> Turn on Dev mode & turn My Ledger provider set it to 44. Go to 'My Ledger' section -> 'Apps catalog' and find and install the 'TON' app to your Ledger