Recently while flashing alpha version of MIUI marshmallow on my Mi 4w, my phone got completely bricked. Complete brick in the sense, it won't turn on, neither charge nor show any led indication. This guide should work on other phones also.Let's start:-
1) Although it seems like your phone wont turn on, your phone is actually working, it's just it wont show anything on the screen(no display).
Make sure your phone is charged properly(it will charge even if the led doesn't show any indication).
2) Download and install Mi flash tool and then Fastboot file of your device. http://en.miui.com/a-234.html
3) Unzip the fastboot image, a folder containing flash all.bat should appear if not, extract the extracted file again. Winrar should work fine.
4) Now open Mi flash tool(as administrator) and select the fastboot folder from Mi flash using browse option and also select the proper fastboot script according to need.
Note: Flash_all.bat will completely erase your internal storage.
5) Now press volume down(-) and power key to enter into fastboot. Note: it won't show any visual whatsoever but it'll work.
6) Connect your phone to your pc. It should show various flash devices connected to your computer and those devices may continuosly connect and disconnect. If not it'll show QHUSUB_BULK install the driver using device manager.
7) On Mi flash tool, some device name should show on the devices list if not click refresh and try reconnecting the device. Note: If you dont have proper drivers installed on your pc, this procedure won't work.
8) Finally click on flash and flashing will start. It'll take some time. Once done it'll show operation completed successfully.
9) Finally boot your device using power key.
1) Although it seems like your phone wont turn on, your phone is actually working, it's just it wont show anything on the screen(no display).
Make sure your phone is charged properly(it will charge even if the led doesn't show any indication).
2) Download and install Mi flash tool and then Fastboot file of your device. http://en.miui.com/a-234.html
3) Unzip the fastboot image, a folder containing flash all.bat should appear if not, extract the extracted file again. Winrar should work fine.
4) Now open Mi flash tool(as administrator) and select the fastboot folder from Mi flash using browse option and also select the proper fastboot script according to need.
Note: Flash_all.bat will completely erase your internal storage.
5) Now press volume down(-) and power key to enter into fastboot. Note: it won't show any visual whatsoever but it'll work.
6) Connect your phone to your pc. It should show various flash devices connected to your computer and those devices may continuosly connect and disconnect. If not it'll show QHUSUB_BULK install the driver using device manager.
7) On Mi flash tool, some device name should show on the devices list if not click refresh and try reconnecting the device. Note: If you dont have proper drivers installed on your pc, this procedure won't work.
8) Finally click on flash and flashing will start. It'll take some time. Once done it'll show operation completed successfully.
9) Finally boot your device using power key.