[Xiaomi Redmi 6 Questions & Answers] Tajil:
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Finally I could fix my redmi 6A after suffering hardbrick. I couldnot enter to recovery neither to fastboot mode. My redmi 6A just give me a black screen with vibration on each approximataley 15-20 seconds.

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Must have tools:

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1.libusb-win & mtk-bypass:

12.52 MB file on MEGA

mega.nz

2.spflash tool (v5 or the latest on no problem)

SP Flash Tool v5.1924 - Download SmartPhone Flash Tool

SP flash tool download - SP Flash Tool v5.1924 is the latest version that can flash Stock ROM, Custom recovery for your MTK based android phone. SPFLASH tool comes as free-ware.

spflashtool.com

3.mediatek driver:

MediaTek_USB_Drivers.exe | by Droidwin for Misc. Software & Hardware Resources

Download GApps, Roms, Kernels, Themes, Firmware, and more. Free file hosting for all Android developers.

androidfilehost.com

4.Install MediaTek USB VCOM Drivers (If required)

5.stock firmware redmi 6A:

Xiaomi Firmware Updater

The ultimate script that provides firmware packages for Xiaomi devices.

xiaomifirmwareupdater.com

or

Download Redmi 6A (cactus) V11.0.9.0.PCBMIXM MIUI 11 Stable Full Rom | XiaomiROM.com

The Stable update V11.0.9.0.PCBMIXM has been officially released for Redmi 6A (codename is cactus). Before updating, please make sure you have …

xiaomirom.com

download and extract, from tgz file u will produce another comppressed file, just extract it once again.

6.auth file

Sp flashtool authentication file!

HIT THE THANKS BUTTON Newer MTK (mediatek) devices usually request for an AUTHENTICATION CERTIFICATE TO FLASH.. here am sharing the file i have.. i have used it on two different phones.. makes me think it can work even on most devices out there...

xdaforums.com

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How to:

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zero step:

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dissembler the back case of your phone. Disconnect the battery connector from motherboard. (if you have any difficulty to open the back case, just see it in youtube)

1st step:

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open up spflash tool as Administrator and prepare it beforehand (later on in third step you must quickly switch the app in order to flash the device successfully).

Make sure to fill out the three inputs in download section tab:

-DA (download agent) if it already filled, then just leave it. if not, you must refer it to DA agent files inside your spflash tool folder. You could download seprately DA file from internet.

-fill up scatter file from stock firmware Rom.

Important ! Dont move or change the scatter file position in firmware folder! It must be inside the firmware folder!

-auth file ( point it out to the auth file)

-now just leave this app open, head onto 2nd step below!

2nd step:

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run: libusb win32.exe:

Tick on Install a Device Filter and Tap Next

-install libusb

-select install a device filter

-Press Volume Up (or down in another model)

-Insert the USB cable

-Now you can see the device’s COM Port in the LibUSB window, Click Install.

Click OK (tips: quickly click the device when it appeared!).

if u failed, just repeat the 2nd step again!

3rd step:

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-Run MTKbypassv4.exe

-Press Volume Up (other device use vol down thoug)

-Insert the USB cable into pc

-press bypass button in app

-make sure all ok/done (green color text)

-now quickly go to spflash app, click download button

eventually spflash will execute flashing the device, wait till it finish (download ok!)!

now try to connect the battery connector and boot it up

Voila, your hardbrick phone has come to life once again!

IMPORTANT!:

here in 3rd step, you would have BROM error (This error clearly means that the Flash Tool has issues finding the COM port on which your device is connected.) if u didnt quick enough to switch to spflash app and click downlod button. If this happen, just resume the 3rd step.