Your Wi-fi is connected to your tello and has no internet connection to download. Press ok and go to Wi-fi settings and connect to a Wi-fi that has internet connection. It will download update. Then reconnect to tello Wi-fi and it will update.
The T1d on the DJI site say’s
Specifications
Supporting Platform: ios7.0+, Android 4.0+
Bluetooth Version: BLE4.0
Charging Voltage: 3.7V-5.2V
Working Temperature: 0°C-40°C
Working Humidity: 20-80%
Working Distance: 7M
Battery Capacity: 600MA