New to this forum. I have a 2009 iMac 27-inch i5 2.66GHZ that came with an AMD Radeon HD 4850 512MB GPU. The card is no longer working when my daughter plays Roblox so I bought a Nvidia Quadro K1100M 2GB GPU to replace the AMD. I have to flash the Nvidia to work in the iMac but I am a little confused as to where to start. Should I get the CH341a programmer and do it that way or do you guys recommend a different method to get the card to work? I am a visual learner so if anyone has some tips or step-by-step guide on how to do this, I would really appreciate it. Thanks.