Huawei Watch GT3 Won't Turn On After Warm-up Warning

Yesterday, when the temperature was around 32-33 degrees, the watch gave an over-temperature warning and turned itself off, counting down from 10. I wanted to turn it on, but it won't turn on. I wonder if the battery is dead. When I connect the phone to the charger, the Huawei text appears. Then it disappears. The device does not turn on. I kept it on charge for 1-2 hours. I held the power button for about 20 seconds. I installed the latest version from Huawei Health, but it still won't turn on. It's overwhelming...