I found the tutorial on 360mods.net.

It wasn't Cofree's tutorial after all.
First off, all credit for this tutorial goes to "bigd23" from 360mods.

I must say I had nothing to do with this tut, so all credit is due to this guy who took the time and effort to put it together.
Here is a copy of the post from 360mods.
UPDATE - Klutsh has released iPrep version 008.8 which includes the iXtreme 1.5 definitions and the new version 1.3.1 of Firmtool. You can download it HERE and there are video tutorials by cofree on flashing each drive type HERE. You can ignore the part about needing to load all 3 firmware types (BenQ\Lite-On\Samsung) shown in the videos. That was a bug in iPrep 008.6 which was used to make the videos and it's fixed in 008.8.
Anyone wishing to use iPrep 006 to update to iXtreme 1.5 can still follow the directions below.
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This will just be a short writeup on updating BenQ and Samsung drives to iXtreme 1.5 using iPrep 006. There will be a full tutorial on using the new JungleFlasher software to do BenQ and Samsung drives soon and also a new edition of the Textbook tutorial covering all of the drives.
Download and install iPrep 006.2 (if you don't already have it):
http://www.360mods.net/index....ails&id=84" onclick="window.open(this.href);return false;
Download and extract the new Firmtool 1.3.1 update:
http://www.360mods.net/index....ails&id=71" onclick="window.open(this.href);return false;
Download and extract the iPrep definitions for iXtreme 1.5:
http://www.360mods.net/index....ails&id=85" onclick="window.open(this.href);return false;
The first thing you want to do after you have iPrep installed is update the definitions and Firmtool with the versions linked above.
Replace the existing ixDef.xml file in the C:\Program Files\iPrep 101 v007\Resources folder with the new one linked above.
Replace the existing firmtool.exe file in the C:\Program Files\iPrep 101 v007\Resources\Tools folder with the new one linked above.
(Note - even though we are using iPrep 006.2 the default installation directory in XP is C:\Program Files\iPrep 101 v007.)
Now simply follow the Textbook 2008 tutorial as though it was the first time flashing. A quick summary:
- You will create a new bootable drive with iPrep (loading the new iXtreme 1.5 firmware in iPrep instead of the 1.4 shown in the tutorial).
- You will then boot to DOS and run dben or dsam to dump your existing firmware. Firmtool will then run automatically to create your new hacked 1.5 firmware.
- Finally, you will reboot both PC and 360 and run fben or fsam to flash the new 1.5 firmware.
This is all covered in much more detail in the Textbook tutorial here. You just want to follow the BenQ or Samsung section as though you were flashing for the first time.
Once the flash finishes writing the 4 banks you are successfully updated to iXtreme 1.5!
Alternate (advanced) method:
If you already have your original firmware backed up and want to skip the dumping step follow the steps below. You will create your new hacked firmware manually first in Windows, then boot to DOS and skip straight to flashing.
Create a bootable drive with iPrep 006.2. Once the drive is formatted, go into the BACKUPS folder on it and create a folder called 1234567. Then go into that folder and create a folder called 12345. The full path on the bootable drive should now be:
\BACKUPS\1234567\12345
- Download the updated "Make iXtreme Firmware.bat" file (includes Firmtool 1.3.1):
http://www.360mods.net/index....ails&id=92" onclick="window.open(this.href);return false;
Extract it to a folder and copy the following 2 things into the folder with it:
1) Your original firmware
2) The iXtreme 1.5 hacked firmware
Then double click the "Make iXtreme Firmware.bat" file and follow the prompts on the screen. This will output a file called "hacked.bin" which is your new 1.5 firmware.
Rename the hacked.bin file you just created to the appropriate name for the drive you're flashing:
Sam-CFW.bin for Samsung drives
BenQ-CFW.bin for BenQ drives
Copy this file to the \BACKUPS\1234567\12345 folder on the bootable drive you created with iPrep. Boot to DOS and skip straight to the flashing, run the following command:
fsam 1234567 12345 for Samsung drives
fben 1234567 12345 for BenQ drives
For reference you can follow along with the flashing section of the Textbook 2008 tutorial for the appropriate drive. Follow along from the point the Textbook tutorial shows the fsam or fben command.
Once the flash finishes writing the 4 banks you are successfully updated to iXtreme 1.5!