Unbricking a hard bricked Meizu M3 Note

I got an old and bricked Meizu M3 Note to fix it. The device isn't mine so I don't know what caused the brick. The device doesn't respond to anything - when clicking the power button or trying to boot into recovery nothing happens, just a black screen. I tried following many tutorials on XDA and other sites, using SP Flash Tool, but nothing worked: * [XDA - Meizu m3 NOTE L681H BRICKED!!! please help])https://forum.xda-developers.com/android/help/meizu-m3-note-l681h-bricked-please-help-t3700024) * [Flyme Forum - Meizu m3 note Hard Brick Fix Tutorial](http://forum.flymeos.com/thread-36503-1-1.html) * [XDA - [Developer Verified] [Tested] [Working] Meizu m3 note Hard Brick Fix Tutorial](https://forum.xda-developers.com/android/development/developer-verified-meizu-m3-note-hard-t3682743) * [XDA - [Guide] Meizu M3 & M3s Unbrick](https://forum.xda-developers.com/android/development/guide-meizu-m3-m3s-unbrick-t3515231) I tried flashing the stock ROM but still nothing. The device keeps connecting and disconnecting every 3 seconds when connecting to a PC using a USB cable. After clicking the Download button in SP Flash Tool and connecting the device, an error message appears: STATUS_BROM_CMD_STARTCMD_FAIL (2005) I'm pretty sure that the MTK drivers are OK because I used them to unlock the bootloader & flash TWRP on two other Meizu M2 Note devices and everything worked fine. * Windows 7 * SP Flash Tool v5.1842