But, because everything's not perfect, you must have a few other things....
***I assume you've already read the first tutorial of this thread so I won't go into details!!!***
1) First of all : find someone with an already modded Xbox . The other little thing is that he MUST have the same "original" HDD than yours .
If he used it for other things than "official Xbox", you need to prepare it as an original (I found a bootCD that can do it in a few seconds!! ) . Don't forget to activate the Xbox Live dashboard if it's not done yet (with a modded xbox, you don't need an original

) . And don't lock/unlock the HDD, it will be easier after.
2) Once you've prepared his xbox HDD as an original and up-to-date one you've got to boot on an evox CD and get linked with your computer . From your computer, access to the HDD to make the changes (copy the default.xbe, rename the .xtf from the font directory and copy bert and ernie) .
3) Test the modifications on the modded xbox : it should boot on evox (or linux, depend of the default.xbe you copied) from the HDD (verify you've removed the Evox CD !!!) . If it doesn't : retry from the beggining
4) get your unmodded box near your computer and turn it on so the HDD get unlocked .
!!!!! I noticed one thing : I tried for a moment to hot swap the HDD, it was recognize by the BIOS but I couldn't acces to it from ghost . I had 1 idea : maybe the Xbox was on the "set time" screen when I unplugged the HDD and it doesn't liked it, so I tried to just push A button a few minutes before swapping the drive and : It worked !!!!! So, if you don't have a screen near your comp to check, just push the button in case of.....
5)Put the HDD "modded and unlocked" and your "new" HDD in the computer (hot swap trick)
6)boot from a ghost 2003 CD
7) run ghost "ghost /IR" (to make it copy the disk bit by bit)

in less than 5 minutes you've got your new driver still locked and ready to run with the exploit installed !!!!
This seems really long to do but it's not .
I have a few xbox HDD spare so I made ghost images of "exploit installed" HDD for every model I founded . now, I just have to open the new xbox, hot swap the HDD and boot from ghost CD to copy the image to the disk .
I tried this method with 4 different new xboxs : it always worked...
Think about making a ghost image of a "new" HDD first in case of problem.....
I hope it was clear enough and sorry for the bad english....