Jiayu S3 : Help needed to resurrect the phone..

Hi all

Thanks for taking the time to read this.

I have access to a 2nd Jiayu s3 on android 4.4.4

I've never been able to connect my Jiayu s3 using SP Flash Tools (some driver issues?)

My Jiayu s3 was running android 4.4.4 and when ever it felt like it, it would freeze and then reboot.

So, like a bull in a china shop.....i factory reseted (included format storage option) which now doesn't allow the phone to boot.. (as there is nothing to boot from!)

The phone won't boot - it's just stuck on the Jiayu (white logo)

Thankfully...
if i start the phone with volume up i see

Recovery Mode
Fastboot Mode
Normal boot

i can connect to the phone with fast boot and it is recognised (via mac / terminal)

what i would like to do :

change all the partition tables to accept android 5.1.x
flash via fastboot all the sections needed to install 5.1

After you're all done laughing at me .. can i please have some help?

Cheers :)