You will likely need custom firmware to read 4K Blu-Ray discs with MakeMKV unless you have a BDXL drive that was purchased before 4K discs came out. These firmw

You will likely need custom firmware to read 4K Blu-Ray discs with MakeMKV unless you have a BDXL drive that was purchased before 4K discs came out. These firmwares are provided by the developer of MakeMKV on his forum. For standard Blu-Ray discs, nothing special is needed. Any Blu-Ray drive will work out of the box.