Re: Used Z1 - want to buy

Hi, 

Yes, I had. 

As i sad it is 

27'' LED IPS(2560x1440) E3-1225v2(3.2 GHz) 8GB (2x4GB)/256GB SSD/HD P4000/DVDRW/Cam/CardR/LAN/WiFi/BT/kbd/mse/W8Pro74 dwngr W7Pro64 (WM558EA#ACB)

So, i want to do 2 thinks.

1) The seller had installed Win10 - how can I downgrade it to W7Pro64 ?

2) Want to install better video. For exaple 680M, will it fit the Z1 ?

Thanks