Your only option is the Twinpeak method which is very hardware-dependent: http://club.myce.com/f81/securom-4-8-5-xxx-using-bw5tweaker-blindwrite5-twinpeak-method-plextor-premium-100849/
Use the attached BW5Tweaker, or copy the attached Twinpeak profile into the profiles folder.
I'm not sure, maybe you can also use Blindwrite 6 or 7, but just in case:
Blindwrite 5 download: http://www36.zippyshare.com/v/lq72SeJu/file.html
P.S.: just in case you aren't aware: there's also a free version of Alcohol 52% which also provides RMPS emulation
EDIT: i forgot to mention that you can also create Twinpeak backups with Alcohol and Aray Scanner: http://club.myce.com/f81/copying-securom-4-8x-5-x-7-x-cds-alcohol-ray-scanner-126424/
Here you can find a portable version of free Alcohol 52% using the MDS v1 standard: http://forum.daemon-tools.cc/f19/image-compatibility-between-daemon-tools-versions-36121/#post144583
You can then burn the patched image with your current Alcohol 120% version.