Mine reads
# modified by GliGli and Tiros for the reset glitch hack
# you might need to fill in this
secret_1BL = "\xDD\x88\xAD\x0C\x9E\xD6\x69\xE7\xB5\x67\x94\xFB\x68\x56\x3E\xFA"
cpukey = ""
XELL_BASE_FLASH = 0xc0000
CODE_BASE = 0x1c000000
but I havent used imgbuild directly since my first couple of RGH.