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Flashing your Huawei Y635-L21 device is a complex process that requires careful attention to instructions and may potentially harm your device. Please note that flashing your device using unauthorized firmware or tools may void your warranty and may potentially cause irreparable damage to your device.

If you still want to proceed, here are some general steps you can follow to flash your device:

Install the necessary drivers on your computer. You can download the drivers from Huawei's official website or from third-party sources.

Download the firmware that you want to flash onto your device. You can find the firmware on Huawei's official website or on third-party websites.

Extract the downloaded firmware file on your computer.

Download and install a flashing tool on your computer. There are several flashing tools available such as SP Flash Tool, Odin, etc. Make sure to choose a compatible tool for your device.

Launch the flashing tool and load the firmware file.

Put your device into bootloader mode by turning it off and then holding the volume down and power button together. The device will enter fastboot mode.

Connect your device to the computer using a USB cable.

Start the flashing process. The tool will flash the firmware onto your device.

Once the flashing process is complete, disconnect your device and reboot it.

Again, please note that this is a general guide and the specific steps may vary depending on the flashing tool and firmware you are using. Additionally, flashing your device using unauthorized firmware or tools may void your warranty and may potentially cause irreparable damage to your device.