INFO:What Is A DEV Nand?A DEV nand (put simply) is a nand image that allows you to create/modify Xbox packages/files easier than doing it by guess work. Should I Use a DEV Nand?To make a long answer short, if you don't know what it is, DON'T mess with it. If you have no experience with editing/creating files, DON'T mess with it. It doesn't offer any sort of advantages over a standard Freeboot image for your every day users. Custom Boot Animations?!?!?!Yes. You can use custom boot animations. There is a downfall to that though. At this time, the console has to actually be fully booted in order to play the boot animation. What that means is you will have to wait a few extra seconds for your console to boot to dash. In order to use custom boot animations, your video must be in .wmv format and placed in the root of the HDD named "bootanim.wmv" without the quotes. To disable custom boot animations, just delete the bootanime.wmv from the HDD and remove the paths in the rgloader.ini. Preparing Your Xbox's HDD: Files you need:Pick the HDD file system for the kernel you will be installing. For this tutorial, i will be installing a 15574 kernel. 13599: HERE14699: HERE14719: HERE15574: HERE Preparing Your USB Stick With the Files: Download the file system for the kernel you wish to install. Extract the .rar archive to a place you have easy access to. Plug in your USB drive. Copy the whole "Filesystems" folder to the USB drive. Do not change the name. 15574 kernel installers must also include the "bootanim.wmv" and the "rgloader.ini" as well. On your console, copy the "Filesystems" folder to the ROOT of your HDD. Also copy the two files "bootanim.wmv" and "rgloader.ini" to the ROOT of your HDD as well. When successful, shut your console down as your done with it for right now. Picture of What Your USB Drive Should Look Like: Here's a Picture of What Your 360's HDD Should Look Like: How to Build a DEV Kit Image:Download: RGLoaderDownload: Rawflash Building the Image:1. Extract and run RGLoader. 2. Select your nand dump. 3. Enter your CPU key. 4. Select the type of hack your console is running. (JTAG, RGH, or RGH 2) 5. Select the kernel you wish to install. (I'm installing 15574) 6. Click RGBuilder. (Red icon with a wrench on it) 7. You will be greeted with a CMD window. Let it do it's thing until It's finished. Then press any key. 8. Put the newly created image on your USB Drive. (Located in the root of the RGLoader folder labeled Image.15574-dev.bin.) 9. Rename the Image "15574-dev.bin" to "updflash.bin" no quotes. 10. Drop Rawflash on the root of the USB Drive with your image. Should look like this: 11.Plug your USB drive into your 360 and boot into Xell (Eject button) 12. Let the console do it's thing. 13. Power down and power cycle your console. (Unplug it from the PSU and wait about 45 seconds.) 14. Plug it back in and enjoy your DEV Kit! How to Change Your DEV Kit's Background/Theme:Here's two themes to get you started. One's a "Blue Metal" theme and the other is a "Gears of DEV" theme. Both created by Errorjack. Download: DEV Theme Pack How to Change the Theme: Copy the theme file you want to a USB drive. FTP into your DEV kit and go to the folder Filesystems/15574-dev Drop the new theme there. Reboot and enjoy. I do NOT authorize this tutorial to be posted anywhere else. Shouts to XPG Tutorial Team: XPG Dutch, XPG Jack, and XPG TOMO.