TJ-4420TN FAQs & Troubleshooting TJ-4420TN Not your product? Sort by Updated Date Popularity 3 Results 1. 12/05/2022 How to update the firmware 2. 12/02/2021 Enable or disable Bluetooth Low Energy (BLE) 3. 23/09/2020 How to update firmware to all printers on the same subnet at the same time More FAQs (English only) Software FAQs & Troubleshooting