MAC spoofing is one of the oldest hardware-fingerprint changes. Sounds simple — change a number in the registry — but in practice there are 5–6 layers, each handled differently.
Layer 1: registry. Software MAC visible to Windows. Easily changed via NDIS. This is where 90% of MAC-changing utilities operate.
Layer 2: NIC firmware (ROM MAC). Some chipsets keep the original MAC even after registry override. Anti-cheats query firmware via WMI and see the real value.
Layer 3: VPN and virtual adapters. They have their own MACs that anti-cheats sometimes count as part of the profile. We recommend disabling VMware/Hyper-V/Hamachi adapters before HWID change.
Our utility writes MAC at layers 1 and 2 simultaneously. Layer 3 we recommend handling manually before applying the change. This combination gives a clean MAC for 99% of anti-cheats.