For anyone interested. It is possible to upgrade your aging Lenovo W500 to 802.11ac wifi, if you have flashed your BIOS without the whitelist. Upgrades I’ve done.
– WWAN F5521GW (Still 3G, but supposedly a bit faster than the original F3507g).
– WiFi Intel 7260 (this is a half hight mini-pcie card, so you need a extension plate).