Approximately every 3–4 months. Security patches usually lag 2–3 months behind. Don’t expect monthly updates.
If you encounter issues during the firmware update process, try the following:
If the screen remains black or flickers, you have the wrong firmware. Immediately unplug and seek the correct file.
⚠️ Never flash T770 (non-H) firmware onto a T770H. The modem and NFC drivers differ.