When WiFi is grayed out on an iPhone, it's most likely due to the damage of WiFi module. Unfortunately, you can't just swap the WiFi IC. The WIFI address is linked and stored in the NAND chip. So in order to replace the WiFi chip, usually, we must use a PCIE NAND chip programmer to unbind the WiFi address, but in this video, we use
iRepair P10 DFU Box. Follow our video for the detailed steps.
https://www.youtube.com/watch?v=PQZvILFcMnM