Are you planning to install or Snow Leopard (10.6) specifically? Virtualizing Mac OS X 10.4 with VMware

However, if you are experiencing boot hangs or checksum errors:

Since this is a custom firmware file often used in the "Hackintosh" and virtualization community, it is primarily hosted on developer repositories and enthusiast forums: GitHub Repositories : Several "Unlocker" projects include the firmware in their directories. You can find it on jtergogit/unlocker207 VMware Unlocker InsanelyMac Forum : This is a primary source for the Unlocker 2.0.x

efi32-srvr.rom is a custom 32-bit EFI firmware used in virtualization environments—specifically