Step 4:
Go to XeX Menu on your JTAG, then go to your USB and select the fan speed you want. (you can always go back to normal by clicking the “autospeed.xex” patch)
Step 5:
Now after you have selected the fan speed patch, restart your JTAG, then the next time you turn it on your fans will be louder/quieter depending on what .XeX you chose.
its easier to just dump your nand and then open it in 360 flash tool and then edit the config file and put your gpu or cpu fan speed at what ever you want