I apologize already for my poor english 
If your m4 aqua won't stay in fastboot mode (so it turns off after a few second), then you have to follow these steps
If your m4 aqua won't stay in fastboot mode (so it turns off after a few second), then you have to follow these steps
1 Download the program from this link "flashtool.net/downloads_windows.php"
2 Install the program
- For steps 3 through 9, you can follow the guide for windows 8 on this page "flashtool.net/win8drivers.php"
With the images (even for those who have windows 10 if you need images to simplify your life
3 Enter the computer settings -> Update and security -> Restore -> "Restart now" under the Advanced start section
4 The computer will reboot -> Troubleshoot -> Advanced options -> Startup settings -> Press "Restart"
5 After restarting another menu will appear, press 7 or F7 on the keyboard
6 The computer will now start
7 After entering the desktop, open the folder where the program was installed, enter the "drivers" folder and start the "Flashtool-drivers.exe" program
8 Select "Flashmode Drivers" and "Fastboot Drivers"
9 Follow the installer instructions until a window appears, where you will be asked if you want to install the drivers, press to install the drivers, and wait until you have finished installing all the drivers
I hope everything is clear and has helped someone :fingers-crossed:
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