As per what obcd has said about versions 1.2 / 1.3 - attached is a copy of the bios needed, you will need to use a 29F040 TSOP flash rom if you have 256KB (29F002BT etc)
https://www.dropbox.com/s/dd1nlqp3ujbueoo/Chihiro_X3_29f040.7z?dl=0
If you have v 1.3 and don't do the Lframe mod to the...