You need the 8.40 "Buffalo" firmware to set booktype/bitsetting on the 109.
This implies crossflashing your 109 to A09 firmware.
I don't have a step-by-step explanation for you, but a quick search on this forum and you'll probably find a link to some guide. It's been covered several times.
Be aware that crossflashing the 109 to A09, though it has many advantages, will void the warranty.