I found the iso. :emb:
Here you have the file (at the end, in attached files), and the instructions:
NEEDED THINGS TO USE THIS DUMP MODE:
-USBDevice in FAT/32 with 8MB or more space
-A blank CD-R/RW
-A moded PS2, or a mode to load homebrew apps
1.
Extract the .iso file from the .7z file. (the same app to extract the emu)
You can download it for windows32->
HERE and for Linux->
HERE
2.
Then you will only have to burn the ISO (121MB) to a CD-R/RW (if your ps2 supports -RW), with a burning app. Like Nero, DVDdecrypter, etc...
3.
Insert the USBDevice (it has to be formated into FAT/32, haven't test with NTFS).
Then start the Ps2.
Use the method to load the CD-R/RW. If you have a modded one, just insert the disc.
4.
THE SHOTS ARE FROM PCSX2, BUT IS ONLY TO EXPLAIN THE PROCESS, THIS SHOULD BE THE SAME IN THE PS2
Now it will show you this:
Just press SELECT.
LaunchElf is asking for a default action. Press CIRCLE ("O")
You have to check if the USBDevice inserted can be used for the dump
THIS STEP IS NECESARY, CAUSE IT LOADS THE USB DRIVERS.
Go to MASS:/ and press CIRCLE. If you see the root of your USBDevice, the dump should work ok. If you don't see anything the USBDevice is not correctly conected or maybe your drive is empty
(like this)
Anyway, press TRIANGLE to go back to the root menu.
LaunchElf asks for a default Elf to load, we will select the DUMPBIOS.elf file in the CD drive.
Press "up" to select CDFS:/, and then press CIRCLE ("O"), you'll see this.
Press "down" 2 times to select DUMPBIOS-MASS, and again CIRCLE.
You have selected the default action, go to "OK" (press 2 times "Up").
We are ready, press CIRCLE ("O") and wait....
The count down to load DUMPBIOS.elf has started, don't touch anything and it will load soon.
When the DUMPBIOS starts, it will show this, and dump will start. It can take long, depends on your USBDevice.
It you get an error message, change the USBDevice to the second Hole, and start over (reset the PS2). If doesn't work, check you USBDevice, or try with another one.
Hope this all helps you.
EDITED:
NOW IT SHOULD WORK. I've tested with V9 and works ok. The text "DUMPBIOS" in the last 4 shots is "DUMPBIOS-MASS" but I'm too lazy to change the shots 
