Someone please help

Hi all

Im griff and new to the vesc world, so please be gentle with me

I bought a FLIPSKY FSESC75100 nearly 2 yrs ago ,but because of my job never had time to fit it

But now I have when I try to connect it via the bluetooth it says 

THE FIRMWARE ON THE CONNECTED VERC IS TO OLD...PLEASE UPDATE IT USING A PROGRAMMER

I have no idea even where to start to do that , Could anyone on here please please please help me ( If this has been covered before I apologise for bringing it back up)

Any idiots guide out there would be so helpful

Cheers Griff