We release multiple different, but very similar images you can choose from. They all should work on all versions of the X230. These are the differences; (xxxxxxxxxx stands for random characters in the filename):

x230_coreboot_seabios_xxxxxxxxxx_top.rom includes the proprietary VGA BIOS from Intel which is non-free software. It is executed in "secure" mode.
x230_coreboot_seabios_free_xxxxxxxxxx_top.rom includes the VGA BIOS SeaVGABIOS which is free software. While technically more interesting, visually this is currently not as beautiful:
    The bootspash image is not shown.
    Early boot console messages (after your HDD's bootloader has started a kernel) might be missing.