Hi Hardkernel, I would like to know the product code of your device, it is written on the underside of the projector. It is not the same as the model name. My product code matches user Adam Matis's product code and this device is definitely incompatible with this Korean update. The way to unbricking this device is very long and complicated so I will not go into details here, but if there are any users in the same situation feel free to send me a message asking how I did it.
I have checked now and this update v04.70.35 has an ID = HE_DTV_W17R_AFAAABAA, which is definitely not compatible with this PF50KG projector. It is not even made for a projector as DTV stands for a digital television. It is also an unreleased beta update (it has NSU in it's name as opposed to USB) so even for compatible products it could have bugs. I think nobody should try using this update on their device unless they really know what they're doing.
Finally, the discoloration that occurred when I tried to force my device to run the Korean firmware looked like the image I attached below, completely broken.