Idol 3 Bootloop

I need your assistance

Hi, I have read through all of the posts and tried to find a solution with no luck.

I tend to always go one step too far with my hacking and playing/experimenting.

Alcatel One Touch Idol 3 5.5 6045K

It was booting into TWRP fine.

Then I wrote the non-functioning boot.img (which I thought was the backup of my pre-rooting version) on top of the working twrp recovery image.
So instead of installing the boot.img to the boot partition, I installed it to the recovery partition by mistake.

So now...

My phone just keeps booting and booting.
Alcatel Screen appears
The SuperSU installer starts
runs through its steps
Done!
Cleaning Up....
Will reboot in 10 seconds....

And starts all over again.

adb does not find any devices anymore
I am wondering if it possible at all to format the external sd card so that the phone will boot directly from there.

I have one single ray of hope ( maybe ) . The phone will boot into download mode. (Power off, hole power, volume up and volume down to activate)
The challenge I have now is the USB driver that was working now does not recognize the phone.

I have tried fastboot and I have also tried the OnDemand script. No luck.
I read that the download mode is used for flashing firmware and roms (most likely by the manufacturer)

Has anyone been able to install a rom using the download method successfully?

I am on Windows 10 All-in-One PC

Thanks in advance for any assistance you can provide.

N101BL