Chosen Solution
everything work fine, tried the hard reset and all, but i have no experience with where the wifi cables and etc. is and so i wont dare to try to open and check before being sure of what it is.
Greyed out Wi-Fi on the iPhone 6 after a drop would defiantly be the Wi-Fi chip. This repair would require microsoldering. The repair cost would be around the price of another iPhone 6.
