Where can I get a jtag?
Always look on the site before looking anywhere else. I will post legit sellers threads below. If you are legit post below your main thread ad I will verify.

Types of Jtags:
Xenon: 1st type of jtag(cheapest)
Zephyr:2nd type of jtag(same generation)
Falcon:3rd type of jtag(2nd generation)more updated
Jasper:4th type of jtag(3rd generation)best type but also most expensive.

DO NOT:Buy a Jtag for just lobbies

Benefits:
Downloading games for free and getting them early.

.also all dlc and xbla games are free as well , NO more disks , games can be stored and launched from an internal drive , usb-hdd & usb thumb drive

games can be made region free ( there are some jap titles never make it here many enjoy )

emulators : mame , sega , nes , snes etc

hacked games : modded default xex's with trainers and modded files inside the game

alternate dashboards like freestyle dash

being able to ftp over to 360 from a pc via xex-menu or freestyle dash : grab a game save or profile to mod , or inject some new dlc or xbla game , or dump a full 360 game over to drive without touching a thing physically
A JTAG allows you to run Unsigned Code that was not written by Microsoft and is not authorized by there systems, not just home-brew as Microsoft do that as well and it can be run on a stock xbox

Out there in the world there are unlimited amount of KVs for JTAGs to run off of, the only problem is that these KVs are inside the xboxs Nand, and Nands are encrypted with 32 Hex code which has millions of permutations, from a stock console you can dump the nand easily and you can extract the Enc KV but you need the CPU key to decrypt the Nand and most importantly the KV

here has been an additional development in the never-ending battle thats Microsoft trying to keep its gaming method closed to unauthorized use. Xbox-scene reports that a new hack called freeBOOT permits the Xbox 360 to upgrade for the newer kernels, but allows the choice of rebooting to an older kernel in order use the JTAG exploit and gain access towards the hardware.

A jtag is an xbox that allows run homebrew code on an Xbox 360. Exploiting this hack makes it feasible to boot a Linux kernel in about five seconds. Weve long been fans of the homebrew work done with XBMC on the original Xbox and hope that advances like this will lead to that end. We want this simply because the older hardware cannot handle high definition content at full resolution but the Xbox 360 certainly can.


Other facts:

A Jtag also comes console banned(meaning you cannot connect to Xbox Live). You can however buy a Jtag that comes unbanned(it is only unbanned for a few hours). If you get banned or it comes banned you will need a KV(Key Vault) to unban it. Another thing is that soon this month or early next month Microsoft will be coming out with a new dashboard update which will kick Jtag's offline even with a Key Vault. If you are looking to go online anytime soon, DO NOT buy one.

Key Vault:

A Keyvault is the part of an Xbox 360 that makes each console unique. It is the part of the Xbox that Microsoft uses to identify which console is connecting to their servers. There are specific details located inside the Keyvault that makes it so important, one of the main details located in the keyvault is the serial number.

The reason Keyvaults are so important to JTAG's is because you can use them to unban your console. You can swap a keyvault from another unbanned JTAG into your JTAG and then your box magically becomes a different console according to Microsoft.

When a Keyvault gets banned, it doesn't ban just the console, it bans the Keyvault, which means every console using that Keyvault becomes banned,YOU CAN NOT MAKE A KV. But you can extract one.