I am looking to buy a TI Nspire CX and dual boot it with 3.1 and 3.1 using nLaunch. The problem is, all new CX's have the new boot2. I read that it's possible to reflash the boot2, to the version that nLaunch and ndless exploit, using an arduino. I have an arduino and I know how to hook all of it up, but how do I actually reflash my nspire? How do I go about the actual reflashing process? I've looked for hours to find a guide, I found many showing how to hook the arduino up but none explaining how to reflash it.

Yes, you can reflash the old Boot2 3.1, but it just won't work on TI-Nspire CX HW-J and we still haven't understood why for now.
So it's useless for now.

See this topic. The calcs with hardware revision J have different hardware, making it impossible to run an older boot2.

I read that topic, and the one previous, which stated

The TI-Nspire community wasn't worried about that:

current TI-Nspire users should simply be careful not to update their Boot2 when updating their system, thanks to the small TNOC tool
in case of omission of this manipulation, it was still possible to reprogram the older Boot2 version using an inexpensive TTL/USB interface (RS232)
and owners of new TI-Nspire CX could also apply this last solution

Since it said that owners of the new CX could do that, I thought it meant I would be able to reflash it.

Well I guess I'll just have to hope no one else tries to snipe this ebay auction then

I read that topic, and the one previous, which stated

Quote

The TI-Nspire community wasn't worried about that:

current TI-Nspire users should simply be careful not to update their Boot2 when updating their system, thanks to the small TNOC tool
in case of omission of this manipulation, it was still possible to reprogram the older Boot2 version using an inexpensive TTL/USB interface (RS232)
and owners of new TI-Nspire CX could also apply this last solution

Yes, we weren't worried at all when we discovered the new Boot2/OS 3.2.4 a couple of months ago, and we were wrong - completely wrong.

Just read further - this isn't the end of the post.

Hopefully you can manage to downgrade that one. Of course you might need a special adapter, but it should be possible.

You need something like an RS232/TTL adapter.

Wow, I haven't been on the forums for a while...
But anyway,  I asked my mom to buy me an Arduino Uno, telling her exactly what it was, but not what I needed it for. She had no clue what I was talking about. 
Hopefully, she'll decide to order it for me from Amazon.
But could someone please make a tutorial vid on how to use the Arduino to downgrade my boot 2 (A.K.A. where to place each wire, etc.)? I recently bought a CX CAS and it came with OS 3.2.4, which unfortunately, has downgrade protection. Luckily, nLaunch CX exists, but I need a Arduino or some other RS232 interface. And I don't know what to do with it even if I already have one. I have an RS232 cord, but I don't know how to use it, and I don't want my new calc to blow up because of over-voltage. Thanks!

Would I need to buy the cords and the white thing(I think that is some sort of voltage regulator, but I'm not sure) that are in the picture, or do they come with the Arduino? And I don't know what revision my calc is either. All I know is I got it in May this year.
EDIT:
You can use Hyperterminal and Xmodem to transfer the file I think but you need Windows XP or less
Otherwise you'll have to find an RS232 program for Windows Vista and above