I have now flashed this new firmware over my Cortex firmware. I used the USB-USB method, which is really quick and easy.
USB-USB Installation software is here:
https://mega.nz/#!rkoVCYqS!bPACrEEUB...bK-XoO7UR4gyjI
Flashing GOTEK via USB:
[ Show youtube player ]
Now testing on my A500 with 512MB upgrade.