Sneakypeanut released a new version of Easy freeBOOT - an application which will automate the creation of a 12611 rebooter (see fbBuild 0.1/freeBOOT v0.04) for JTAG-able consoles:

You will need a working nand image for your jtag and your cpu key.
You can get a nand backup using FSD or flash360.
And your CPU key by booting into XeLLous and telling this program to get the key.

Procedure:
1 – run the software
2 – Select your nand
3 – Check your CPU key
4 – Wait for the creation
5 – Place the image on your USB drive
6 – Flash
7 – Enjoy!
Official Site: n/a, by Sneakypeanut
Download: n/a (might be illegal under DCMA/EUCD)
News-Source: logic-sunrise.com | se7ensins.com