Official updates for the Custom Order Maid series occasionally include hair fixes as part of broader patches:

The legacy version of CM3D2 treated hair as rigid, monolithic 3D meshes. The V2 update completely changes this workflow:

New versions frequently add "colourable" layers, enabling users to change hair colours dynamically within the game's UI rather than relying on static textures. Cross-Platform Portability

To get an update working, you'll likely need the following tools: