1. I will certainely do that,... I just wanted to know if a GPU flash can higher the temperature the GPU needs to have before it activates its fans.
2. I am aware that they have an order, and checked them one by one. I am 100% sure none of my GPUs were Micron/Samsung (only hynix and some Elspidia)
3. Yes I made a BIOS backup of every card (with GPUz), and will use them to see if the fans work back to normal. My cards are all different, and I modded each one of them and flashed them one by one.