It'll likely need a bios update if it's a Z87, and installing that's going to be tricky if the only compatible CPU you have available requires a bios update before you can use it. He should probably wait and see if motherboard manufacturers start shipping things with updated bios instead of buying something and hoping it'll work.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
