Hello All - I've installed El Capitan in a VM (VMware Workstation 12) using the instructions from: http://www.insanelymac.com/forum/topic/309556-run-vanilla-os-x-el-capitan-yosemite-or-mavericks-in-vmware-workstation-12-on-a-windows-host/ Everything is up and running fine, however I'm having a problem while trying to manually input the MLB and ROM values to get iMessage working. I grabbed both values using iMessageDebug from a MacBook Air I own. The lines I entered into the .vmx file are below. smbios.reflectHost = "FALSE" board-id.reflectHost = "FALSE" board-id = "Mac-#######" hw.model.reflectHost = "FALSE" hw.model = "MacBookAir7,2" serialNumber.reflectHost = "FALSE" serialNumber = "My serial #" efi.nvram.var.ROM.reflectHost = "FALSE" efi.nvram.var.MLB.reflectHost = "FALSE" system-id.enable = "TRUE" efi.nvram.var.MLB = "My MLB" efi.nvram.var.ROM = "My ROM" smc.version = "0" I understand the ROM is supposed to be a 12 character hexadecimal that needs to be converted to ASCII, but when I go to convert my ROM its not a valid hexadecimal value (although it is 12 characters). Is there something else I'm missing?