All You Know There Are NEW Mods Online, Let Me Explain For You
You Need A Modified XEX AND Modified MP File
Which Unknown_v2 Has Modified.

This Is Where You Need The JTAG Hack And freeBOOT
FreeBOOT Allows Retail Consoles To Run Modified XEXs

For All Of You Who Have This Set Up, Remember These Files Are Not Just Gonna Get Handed To You...Unknown_v2 Worked Extremely Hard On This!

The JTAG HACK:

There is a new hack which can boot homebrew code in less than 5 seconds. See
at the end of this document for a description how the hack works. For now,
all we need to know is that this is a new way to exploit the well-known 4532
kernel, in a way which also works on updated machines, unless they have been
updated by the summer '09 update. It also works on all hardware types.

This document is a technical description meant for people who want to
undestand the hack. If you don't understand a word, calm down - there
probably will be future releaes, howtos etc.

Please also notice that from a functional side, the result will be the same
as the KK-hack; it's just must faster, works on more hardware and is more
reliable. So it replaces the KK-hack, not less and not more.

freeBOOT:

Ikari released the first version of ‘freeBOOT’ for xenon (v1) and falcon (v3) consoles with JTAG/SMC-Hack. This hasn’t been tested yet, so try/use at own risk for now.
A ‘rebooter’, allows to ‘reboot’ the 360 into an MS kernel after starting it with the JTAG Hack … in this case (freeBOOT v0.01) it should reboot the console into MS kernel 8498 (but I assume 8507 will be possible too, and it’s probably also the first step into rebooting into patched/modified MS kernels).

The readme says it requires the Cygnos360 v2 chip atm, I’m assuming they need it to automatically reset the SMC back to original.
Booting your 360 into 849x+ and keeping the JTAG Hack working was impossible until now, because updating to 849x+ via the MS update procedures burned a CB-fuse which made it impossible to still perform the JTAG Hack. If you already updated your console to 849x+ via normal update methods there is still no solution for you, but if you have a JTAG ‘hackable’ console (kernel 7371 or lower on NAND) freeBOOT should allow you to ‘re boot’ it into 8498 via the JTAG Hack.

Basically a retail console turning into a homebrew devkit.

Can lauch unsigned code.
Plays Unsigned XEX's
Will not check Live/Pirs container signatures(Free content for this console)
Accepts any sata harddrive
and more.

Another Thing Is: People Will Say They Have The Mods Without This Set Up

This Is Because These Mods Infect Everyone That Plays In The Game
You Can Start New Matches And You'll Have It Then When People Join
You Will Infect Them Then They Start One And It Keeps Going...

Have Fun

So basically like that one day everything went alvin and the chipmunks with super speed lol nice