Kryptview A750 - Not flashing properly - Help!!

Thanks again for your help.

On my Vista laptop, Device Manager confirmed that I was correctly selecting com port 4. Still no joy.

On my very old XP laptop, when I go into Device Manager, there is no " Click the + sign next to "Ports (COM & LPT)" . There is a list of items but none called "Ports (COM & LPT)" or similar.

I am going to borrow a mates XP laptop at the weekend and give it a go there.