What is the reason why Duowei mobile phone suddenly shows no command?

The reason why Duowei phone suddenly shows no command may be that the phone system is damaged, and it is recommended to restore the system with the following operations to solve the problem:

Press and hold the power off button and volume plus button on your phone to enter the safe mode of your phone, and then enter the phone settings from the safe mode of your phone to find Storage and Backup.

Enter the storage and backup interface and select factory reset, you can restore the phone system to the original system, restart the phone after the recovery.

If the problem cannot be solved after the above operations, it is recommended to bring the mobile phone and warranty card to the designated maintenance point for inspection and repair.

It should be a problem with upgrading files, and it is recommended that the landlord use the corresponding model of flashing package to flash the machine.

1. Press and hold the power button to turn it off.

2. Power button and volume down - press at the same time until the screen lights up.

3. When the "no command" robot falls to the ground and the red fork appears, then you only need to press and hold the power button first (the power button does not release).

4. Then press the volume plus to enter the official recovery, and restore the factory settings of double clearing.

Hello !

According to your description, Duowei T21 mobile phone can't turn on, it is recommended to try it according to the following steps:

When the device is fully charged, after backing up data, press and hold the [Power Button] and [Volume +] buttons for 10 seconds with the device off (off).

After entering recovery mode, move the cursor with [Volume+], Volume-] (see figure below).

Operate 2-wipes again

Select Wipe Data Factory Reset > yes, home] to confirm.

Select wipe cache partition > yes , home] to confirm.

Select reboot system now > yes , home] to confirm.

After doing so, restart and you're done.

If the problem persists after 2-wipes, it is recommended to press and hold the [Power Button] and [Volume-] buttons for 10 seconds to enter fastboot mode

Connect to your PC and use Flash Tool to flash the official ROM to repair the system.

Hope this helps you!!

Summary. Hello, do you use automatic shutdown to cause the phone to not turn on? If this is the case, you will need to go to the repair shop to activate the battery.

Hello, please ask if you use automatic shutdown to cause you to not be able to open the sock rock machine? If this is the case, you will need to go to the repair shop to activate the battery.

No. Ok, I see, the file is being sorted out, please later.

Hello, this is Yu Liang's phone crashed. Press and hold the "Volume +" and "Volume -" keys at the same time, and after holding down, add a vertical "power button" to form a simultaneous press and hold of these 3 keys. This will force the phone to power on.

The time of pressing must be longer, at least 20 seconds, and what should I do if I still can't turn it on.

Dear,Disrespectful sail will,If there is no problem with the hardware of the mobile phone,This way will be turned on,Please make sure that the time you press is long enough,Press the three buttons at the same time。

Ann for 30 seconds and still like this.

Can you tell me if he crashed for no reason or what?

If the above method cannot be turned on, then you can only contact the after-sales service, indicating that there is a problem with the hardware of the mobile phone or the system has crashed.

Water ingress into the charging port.

Know, the motherboard of your mobile phone has been flooded, so it can't be turned on, and it's only a loss that the banquet can be taken for repair, but the hardware is faulty and the motherboard needs to be replaced.

It is recommended that you wait for a while, it is possible that the water will evaporate naturally, and you will be able to turn it on.

This problem can be solved by flashing the machine as follows:

<>4. Select the ROM package for flashing.

5. Next, you can flash the machine with one click.

6. After entering the "one-key flashing" mode, the automatic flashing mode will be started until the flashing is completed.