-Turn off your phone, and after it turned off, push and hold the Volume Up button and at the same time connect the phone to the computer with a USB-cable. This will trigger FASTBOOT mode and windows will start driver installation, point the driver installation to that location of the files youve downloaded earlier, drivers.zip Folders [size=2][color=red]( This is the tricky part as you need to do it fast before the popup for Driver search gone )

-Turn off your phone, Disconnect from PC and after it turned off, push and hold the Volume Up button and at the same time connect the phone to the computer with a USB-cable. This will trigger FASTBOOT mode and windows will start driver installation, point the driver installation to that location of the files youve downloaded earlier, drivers.zip Folders
( This is the tricky part as you need to do it fast before the popup for Driver search gone )

-There is another way to install fastboot drivers , by go to "C:\Flashtool\drivers" and launch the Executable, thick ALL options and install, once done, restart your pc and reconnect your phone in FASTBOOT mode ( Download flashtool below )

-Download : Flashtool v0.9.10.1 [Flashtool]

-Once your windows finished installing the Fastboot driver, let it be and proceed to the folder where you placed "fastboot_with_Android_USB_file" folder. Open up " fastboot_with_Android_USB_file > fastboot ". Right click at the background of the folder while holding SHIFT button.

-Select 'Open command window here' and Command Prompt will pop out

-Make sure your phone is in Fastboot mode ( Blue LED color emitted at the Notification Light)

after install fastboot driver by downloading flashtool, im trying to reconnect in FASTBOOT mode but when I push and hold volume up button, connect my phone via USB,  the Blue LED at notification just like for 5 seconds , then it will show sony icon and starting to show charging . Sorry this is my first attempt since Im really noob