Using the hardware buttons or an attached keyboard, navigate the recovery menu to select or "Apply update from USB" .
Ensure you are using the number keys above the QWERTY row, not the numpad. Full-upgrade-package-dten.zip
Ensure that the specific Full-upgrade-package-dten.zip you downloaded matches your exact model (e.g., DTEN D7 55", DTEN ON 55", or DTEN ME). Applying firmware meant for a different hardware architecture can permanently brick the unit. Using the hardware buttons or an attached keyboard,