Try this:
Edit build.py in Multibuilder by inserting the following line:
[0xb74ae419,"Zephyr, version 1.9",[[0x1242,0x00,0x00]]],
So it looks like this:
SMC_patches = [[0xf9c96639,"Trinity, version 3.1",[[0x13b3,0x00,0x00]]],
[0x5b3aed00,"Jasper, version 2.3",[[0x12ba,0x00,0x00]]],
[0xb74ae419,"Zephyr, version 1.9",[[0x1242,0x00,0x00]]],
[0x9ad5b7ee,"Zephyr, version 1.10",[[0x1257,0x00,0x00]]],
[0x7e5bc217,"Zephyr, version 1.13",[[0x12a3,0x00,0x00]]],
[0x1d0c613e,"Falcon, version 1.6",[[0x12a3,0x00,0x00]]]]
Then run your original nand through Multibuilder and see what happens