And yeah, if you want to do it correctly - replace the chip, there is no easy way to get one. Most of what is sold is a crap from Chinese sewers. They take E-waste, remove/reball the chips, sell as new/refub/used, whatever. The problem is, those chips for which demand is the highest, also fail most often. Therefore those E-waste boards usually failed because of faulty GPU/chipset BGA chip. So in the end you get the same faulty crap (resurrected by heating) as what you want to replace. Also removing old marking and applying new one, is very often. The same die is used in many chip modifications, sometimes remarked chips work, sometimes not, often depends on the actual motherboard. All I can say, doing this kind business with conscience and earning something at the process is nearly impossible.