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MT6737T__QMobile__Noir_X1S__Noir_X1S__7.0__SWW1627QM_0402_T5343
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Qmobile x1S dead recover by flashing

If your QMobile X1S smartphone is dead and cannot be turned on, it's likely that the firmware (operating system) on the device is corrupted or has become damaged. One way to fix this issue is by flashing the firmware on the device. This is essentially a process of replacing the current firmware on the device with a new version.
Before you proceed with flashing the firmware on your QMobile X1S, it's important to make sure that you have a backup of any important data on the device, as flashing the firmware will erase all data on the device. Additionally, you'll need to obtain the appropriate firmware file for your specific device model and variant, as well as a flashing tool, such as SP Flash Tool.
Here are the general steps you can follow to flash the firmware on your QMobile X1S:

Download and install the SP Flash Tool on your computer.

Obtain the firmware file for your specific device model and variant and extract the files to a folder on your computer.

Open SP Flash Tool and load the firmware files by clicking on the "Download" button and selecting the folder where you extracted the firmware files.

Connect your QMobile X1S to the computer using a USB cable. Make sure that the device is turned off before connecting it to the computer.

Click on the "Download" button in SP Flash Tool to start the firmware flashing process.

Wait for the flashing process to complete, which can take several minutes. Once the process is complete, a message saying "Download OK" will appear in SP Flash Tool.

Disconnect your QMobile X1S from the computer and turn it on. The device should now be running the new firmware and should be functional again.

It's important to follow these steps carefully, as a mistake could cause further damage to your device. Also always make sure that you are downloading the firmware file of your device specific model and variant, wrong firmware can cause serious damage to the device.