[HELP] [BRICKED] mt6589 device, Tecno F8, in bootloop

[yaassyr]

Hello guys, i have a Tecno F8 mt6589 that got bricked in bootloop and continually reboot from the logo screen. I dont know what happened but i can access its recovery mode and the factory mode. i tried a lot of things to make it discoverable by my Windows 8.1 PC but this is what i see in the device manager: "unknown USB device (device descriptor request failed)", Trouble shooting doesn't work.
When i boot into factory mode and made an auto test, the test result is:
[ x ] eMMc
[ ] Wi-Fi
and when i select the clear eMMc option it will just show formatting eMMc and suddenly, within less than a second, the phone reboot with continues bootloop. I dont know what happened with the eMMC
While in the system recovery mode i can do anything but i cant use the apply update from sd card option.

Please i need your help

Also, there's no sign of detection when i switch off and connect the phone to the PC, even if i remove the battery and replace it back. The phone only start as if its going to start charging then continue to its bootloop upon the connection. It is only discoverable as "unknown USB device (device descriptor request failed)", when i boot into either the recovery or factory mode.

[Sniper47]

how did it get this way?

Do you have a full correct ROM for this phone?

[yaassyr]

Yes, i have cwm recovery back up